bug (http://trac.wxwidgets.org/ticket/16440) in FSLDIRDialog.

the main frame.

generates the region list on the wx idle loop, so the user can do other
stuff while big atlases are loading.

screws with font colours on OSX (due to a bug in wx).

starting with the fsl.utils package.

module.

actually draw under Linux/GTK. ProcessingDialog now (by default) runs
task in a separate thread, and periodically wx.Yields, to ensure that
the dialog does get drawn.

display on linux/gtk

 - RenderTexture unbinds itself on frame buffer configuration fail,
   before raising an error.
 - RenderTexture was potentially doing integer division on texture
   size ratio calculation
 - GL21 LineVector software draw could possibly be called before
   line vertices had been created.
 - Line/RGB vector command line args were not enabled
 - RGBVector was not initialising texture interpolation correctly

SimpleMessageDialog, which just displays a plain message, and
TimeoutDialog, which shows said message, and disappears after a
timeout. ProcessingDialog now inherits form SimpleMessageDialog.

Another dialog, TextEditDialog, shows an editable/selectable piece of
text. This is used by a new CanvasPanel action, showCommandLineArgs,
which pops up a dialog allowing the user to copy the command line to
recreate the currently visible scene.