I've severely hacked over the startup configuration process for
XPilot, to some extent as discussed on the XPilot mailing list.   My
changes affect command-line options, map file format, and local config
file format.

What this means is that you can now control any configuration option
from the command line, the map file, or the local defaults file - the
system is completely orthogonal.   In general, options specified on
the command line take precedence over options specified in the map
file, which take precedence over options specified in the local
defaults file, all of which take precedence over the built-in
defaults.   This precedence can be overridden in some ways.

Map files and config files have exactly the same format - in fact, you
can specify map data in the config file if you want, although of
course a map file will generally override this.   The format is fairly
simple - each configuration option is specified as a name, followed by
a colon, followed by the associated data.

Names must start with an alphabetic character, and may contain any
character other than a ':' internally, although internal whitespace is
ignored.   Name comparisons are case-independant, so the names ``shot
speed'', ``ShotSpeed'' and ``S hoT spEEd'' are all equivalent.

Values may contain any character other than '#', newline and NUL, but
leading and trailing whitespace is discarded.   Values may include a
\override: prefix, which overrides the command-line value in the case
of the map file, and overrides both the command-line value and the map
value in the case of the configuration file.

Multi-line values (e.g, the map data) may be specified using the
\multiline: <delimiter> prefix - all subsequent lines up to but not
including a line which matches the remainder of the value field will
be stored as the value, and the delimiters will be discarded (see
below for an example).   If no delimiter is found, the end of the file
is silently taken as a delimiter.

Blank lines and lines with only whitespace and comments are ignored,
and any characters following a # character on a line are also ignored.

Options specified on the command line may use the same names as are
specified in config files, although special command-line-specific
names have been provided as well for backwards compatibility (see
below).

A typical map file might look something like this (a bit truncated, of
course):

mapWidth: 10
mapHeight: 10
mapAuthor: Ted Lemon
mapName: InnerSpace
mapData: \multiline: foo
xxxxxxxxxx
x        x
x        x
x        x
x        x
x        x
x        x
x* *  * *x
x        x
xxxxxxxxxx
foo

There is no imposition of order in this file - for example, the map
data can appear at the beginning or in the middle, as long as the
delimiter is used.

A typical local defaults file might look something like this:

gravity: \override: 0	# Nobody in their right mind wants gravity!
maxRobots: 4		# More robots start to clutter things up...

The set of all possible config file, map file and command line options
is enumerated in cmdline.c, and can be easily extended.   Currently,
the following options are available:

option name                             default description
--------------------------------------- ------- -------------------------------

mapName					unknown	Name of the map
mapAuthor				anonymous	Name of map's author
mapWidth				100	Width of world
mapHeight				100	Height of world
mapData					none	The map's topology
gameDuration
time					0.0	Duration of game in minutes.
gravity					-0.14          Gravity strength
shipMass				20.0           Mass of fighters
shotMass				0.1	Mass of bullets
shotSpeed				21.0	Maximum speed of bullets
shotLife				60	Life of bullets in ticks
fireRepeatRate
fireRepeat				2	Number of frames per
						automatic fire (0=off)
maxRobots
robots					4	How many robots do you want?
robotsTalk				false	Do robots talk when they die,
						kill, etc.?
robotsLeave				true	Do robots leave the game?
robotLeaveLife				50	Max life per robot (0=off)
robotLeaveScore				-90	Min score for robot to play
						(0=off)
robotLeaveRatio				-5	Min ratio for robot to play
						(0=off)
maxPlayerShots
shots					256	Maximum bullets present at one
						time
shotsGravity				true	Are bullets afflicted by
						gravity?
idleRun
rawMode					false	The robots keep playing even
						if all human players quit.
noQuit					false	The server keeps running even
						if all players have left.
contactPort
port					15345	Contact port number
motd					none	File name for server-motd
allowPlayerCrashes			yes	Can players overrun other
						players?
allowPlayerBounces			yes	Can players bounce with other
						players?
allowPlayerKilling
killings				yes	Should players be allowed to
						kill one other?
allowShields
shields					yes	Should we allow shields?
playerStartsShielded
playerStartShielded			yes	Players start with shields up
shotsWallBounce				no	Do shots bounce off walls?
ballsWallBounce				yes	Do balls bounce off walls?
minesWallBounce				no	Do mines bounce off walls?
itemsWallBounce				yes	Do items bounce off walls?
missilesWallBounce			no	Do missiles bounce off walls?
sparksWallBounce			no	Do thrust spark particles
						bounce off walls to give
						reactive thrust?
debrisWallBounce			no	Do explosion debris particles
						bounce off walls?
maxObjectWallBounceSpeed
maxObjectBounceSpeed			40	The maximum allowed speed for
						objects to bounce off walls
maxShieldedWallBounceSpeed
maxShieldedBounceSpeed			50	The maximum allowed speed for
						a shielded player to bounce
						off walls
maxUnshieldedWallBounceSpeed
maxUnshieldedBounceSpeed		20	Maximum allowed speed for an
						unshielded player to bounce
						off walls
maxShieldedPlayerWallBounceAngle
maxShieldedBounceAngle			90	Maximum allowed angle for a
						shielded player to bounce
						off walls
maxUnshieldedPlayerWallBounceAngle
maxUnshieldedBounceAngle		30	Maximum allowed angle for an
						unshielded player to bounce
						off walls
playerWallBounceBrakeFactor
playerWallBrake				0.89	Factor to slow down players
						when they hit the wall
						(between 0 and 1)
objectWallBounceBrakeFactor
objectWallBrake				0.95	Factor to slow down objects
						when they hit the wall
						(between 0 and 1)
objectWallBounceLifeFactor		0.80	Factor to reduce the life of
						objects after bouncing
						(between 0 and 1)
wallBounceFuelDrainMult
wallBounceDrain				1.0	Multiplication factor for
						player wall bounce fuel cost.
wallBounceDestroyItemProb		0.0	Player wall bounce item damage
						probability.
reportToMetaServer
reportMeta				yes	Keep the meta server informed
						about our game?
limitedVisibility			no	Should the players have a
						limited visibility?
limitedLives				no	Should players have limited
						lives?
worldLives
lives					0	Number of lives each player
						has (no sense without
						limitedLives)
teamPlay
teams					no	Should we allow team play?
teamAssign				yes	Should player be assigned to
						first non-empty team if team
						isn't set?
teamImmunity				yes	Should other team members be
						immune to various shots,
						thrust etc.?
emcsReprogramMines			yes	Do ECMs reprogram mines?
playerMinimumStartFuel
playerMinStartFuel			400.0	Minimum amount of fuel a player
						will have after being killed
targetKillTeam				no	Do team members die when their
						last target explodes?
targetTeamCollision
targetCollision				yes	Do team members collide with
						their own target or not
treasureKillTeam			no	Do team members die when
						treasure is destroyed?
treasureCollisionDestroys
treasureCollisionDestroy		yes	Destroy balls on collisions
treasureCollisionMayKill
treasureUnshieldedCollisionKills	no	Does unshielded collision kill
						player
onePlayerOnly				no	One player modus
timing
race					no	Race mode
edgeWrap				no	Wrap around edges
edgeBounce				yes	Players and bullets bounce
						when they hit the edge
extraBorder				no	Give map an extra border of
						solid rock
gravityPoint				0,0	If the gravity is a point
						source, where does that
						gravity originate?
gravityAngle				90	If gravity is along a uniform
						line, at what angle is that
						line?
gravityPointSource			false	Is gravity originating from a
						single point?
gravityClockwise			false	If the gravity is a point
						source, is it clockwise?
gravityAnticlockwise			false	If the gravity is a point
						source, is it anticlockwise?
framesPerSecond
FPS					18	Number of frames per second
						the server should strive for
allowNukes
nukes					False	Should nuclear weapons be
						allowed?
allowClusters
clusters				False	Should cluster weapons be
						allowed?
allowModifiers
modifiers				False	Should the weapon modifiers be
						allowed?
allowLaserModifiers
lasermodifiers				False	Can lasers be modified to be
						a different weapon?
allowShipShapes
ShipShapes				True	Are players allowed to define
						their own ship shape?
playersOnRadar
playersRadar				True	Are players visible on the
						radar
missilesOnRadar
missilesRadar				True	Are missiles visible on the
						radar
minesOnRadar
minesRadar				False	Are mines visible on the
						radar
nukesOnRadar
nukesRadar				True	Are nukes visible or
						highlighted on radar
distinguishMissiles			True	Are different types of
						missiles distinguished
						(by length)
maxMissilesPerPack			4	Number of missiles gotten by
						picking up one missile item.
identifyMines				True	Are mine owner's names
						displayed
shieldedItemPickup
shieldItem				False	Can items be picked up while
						shields are up?
shieldedMining
shieldMine				False	Can mines be thrown and placed
						while shields are up?
laserIsStunGun
stunGun					False	Is the laser weapon a stun gun
						weapon?
nukeMinSmarts				7	Minimum number of smart
						missiles needed to make a
						nuclear variant
nukeMinMines				4	Minimum number of mines needed
						to make a nuclear variant
nukeClusterDamage			1.0	How much each cluster debris
						does damage wise from a nuke
						variant Also reduces number of
						particles in the explosion
mineFuseTime				0.0	Time after which owned mines
						become deadly, zero means never
movingItemProb				0.2	Probability for an item to
						appear as moving
dropItemOnKillProb			0.5	Probability for dropping an
						item (each item) when you are
						killed
detonateItemOnKillProb			0.5	Probability for undropped
						items to detonate when you are
						killed
destroyItemInCollisionProb		0.0	Probability for items (some
						items) to be destroyed in a
						collision
itemProbMult
itemProbFact				1.0	Item Probability
						Multiplication Factor scales
						all item probabilities
maxItemDensity				0.00012	Maximum density [0.0-1.0] for
						items (max items per block)
itemEnergyPackProb			0	Probability for an energy pack
						to appear
itemTankProb				0	Probability for an extra tank
						to appear
itemECMProb				0	Probability for an ECM item
						to appear
itemMineProb				0	Probability for a mine item
						to appear
itemMissileProb				0	Probability for a missile item
						to appear
itemCloakProb				0	Probability for a cloak item
						to appear
itemSensorProb				0	Probability for a sensor item
						to appear
itemWideangleProb			0	Probability for a wideangle
						item to appear
itemRearshotProb			0	Probability for a rearshot item
						to appear
itemAfterburnerProb			0	Probability for an afterburner
						item to appear
itemTransporterProb			0	Probability for a transporter
						item to appear
itemLaserProb				0	Probability for a Laser item
						to appear
itemEmergencyThrustProb			0	Probability for an Emergency Thrust
						item to appear
itemTractorBeamProb			0	Probability for a Tractor Beam item
						to appear
itemAutopilotProb			0	Probability for an Autopilot item
						to appear
itemEmergencyShieldProb			0	Probability for an Emergency Shield
						item to appear
initialFuel				1000	How much fuel players start
						with
initialTanks				0	How many tanks players start
						with
initialECMs				0	How many ECMs players start
						with
initialMines				0	How many mines players start
						with
initialMissiles				0	How many missiles players start
						with
initialCloaks				0	How many cloaks players start
						with
initialSensors				0	How many sensors players start
						with
initialWideangles			0	How many wideangles players
						start with
initialRearshots			0	How many rearshots players
						start with
initialAfterburners			0	How many afterburners players
						start with
initialTransporters			0	How many transporters players
						start with
initialLasers				0	How many lasers players
						start with
initialEmergencyThrusts			0	How many emergency thrusts
						players start with
initialTractorBeams			0	How many tractor/pressor beams
						players start with
initialAutopilots			0	How many autopilots players
						start with
initialEmergencyShields			0	How many emergency shields
						players start with