[PythonCAD] Changes in repo for dimension editing abilities

[Art Haas]

Hi.

The code for changing Dimension instance attributes has been changed so
that both 'act->select' and 'select->act' operations are available. I
think I'm going to split up the code that adjusts the DimString entities
so that each attribute individually will have code for adjustment;
currently this isn't how things are done. If you want these changes
just do an 'svn update' and you'll get them.

A couple of other various bug fixes have gone in as well, many of which
have been found while testing the entity modification routines. Yay!

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