[PythonCAD] More updates available at repo

[Art Haas]

Hi.

Just a quick word that more updates are available at the repo and a
simple 'svn update' will bring them to your copy of the code. I've
fixed a number of redraw issues regarding transferring entities
between layers and other editing operations, though still more fixes
will be needed (i.e. entity moving).

The latest fixes also include a nice optimization regarding operations
where multiple entities are added, deleted, or modified. The changed
redraw code was calling the gtk.DrawingArea queue_draw() method for
each entity change; this call copies the offscreen pixmap onto the
screen. If an operation was done on a group of entities, such as
deleteing everything within a box, then each deletion would end up
invoking queue_draw(), even though you probably could not see it.
Now, thanks to adding some new messages to the Image class, operations
contained within startAction()/endAction() blocks will do whatever
offscreen drawing is needed, but the queue_draw() call will only happen
once endAction() is called, potentially avoiding many refresh calls
yet showing the one that counts - the results of all the operations.

I'm going to try and make a release at the end of this week, but if
that doesn't happen then most likely next week will see a release.

Art
-- 
Man once surrendering his reason, has no remaining guard against absurdities
the most monstrous, and like a ship without rudder, is the sport of every wind.

-Thomas Jefferson to James Smith, 1822