Traits 3.1.1
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 * Fixed bug in DateEditor which would not display Feb correctly if the current date was visible and greater than the number of days in Feb
 * Reduced border_size from 1 to 4 for Group instances
 * Fixed layout issues:
   * Windows are now resized if they are larger than the desktop
   * Windows are now put in a valid location if they were opened off-screen
   * Windows with smaller parent are no longer opened at invalid positions with negative y values
 * Implemented editable_labels attribute in the TabularEditor for enabling editing of the labels (i.e. the first column)
 * Fix bug in ListEditor where a trait change listener would be fired when intermediate traits changed (when extended_name was of the type item1.item2.item3..) leading to a traceback.
 * Saving/restoring windows now works with multiple displays of different sizes
 * New ProgressDialog
 * Improved window colors to match desktop colors more closely
 * Replaced calls of wx.Yield() with wx.GetApp().Yield(True)
 * Changed default font to use system font
 * Fixed TabularEditor compatibility problem with wx 2.6 regarding the page-down key
 * Fixed bug in propagating click events in the TabularEditor to parent windows
 * DateEditor wx 2.6 compatability fixed
 * TableEditor scrollbar fixed
 * Improved support for opening links in external browser from HTMLEditor
 * Reduced the number of update events the PythonEditor fired
 * moved grid package from TraitsGui egg into enthought.pyface.ui.wx
 * moved clipboard from enthought.util.wx into pyface