E&S CVS Commit: Trellis - Refactor to use a Cells-like forward/backward propagation system.

[pje at eby-sarna.com]

Author: pje
Date: Fri Jun 23 00:33:08 2006
New Revision: 2200

URL: http://svn.eby-sarna.com?rev=2200&view=rev
Log:
Refactor to use a Cells-like forward/backward propagation system.  
Separated thread-specific "current observer" state from trellis state.  
Tests still pass, but are far from sufficient and the docs are crap; 
you're better off not reading them yet.  Effectively this is just a 
checkpoint to have a jumping-off point for more extensive changes, like 
making values know what trellis they belong to, and redoing the 
docs/tests to maximize both line and scenario coverages.

Removed:
    Trellis/_threading_local.py
Modified:
    Trellis/README.txt
    Trellis/peak/events/trellis.py
    Trellis/setup.py