[PythonCAD] More improved entity modification code now at repo

[Art Haas]

Hi.

I've sent my changes that allow for adjusting individually the DimString
attributes in a Dimension to the repository. Each attribute has a menu
choice now, where in the old code there was a large dialog box that
presented all the various attributes. The code is not yet finalized,
but the changes made will allow for both 'act->select' and 'select->act'
modes for modification. I'll be testing and tinkering a bit more today
and tomorrow, so expect a few more commits to adjust things.

This is the last batch of changes I'll make before making another
release. Probably by Friday or Saturday the next release will become
available.

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