E&S CVS Commit: Trellis - Fix the "sensor undo" and "set before recalc" bugs; add some disabled

[pje at eby-sarna.com]

Author: pje
Date: Sat Feb 21 22:51:22 2009
New Revision: 2598

URL: http://svn.eby-sarna.com?rev=2598&view=rev
Log:
Fix the "sensor undo" and "set before recalc" bugs; add some disabled 
tests for circularity-detection edge cases.  (Making them pass will
require a re-think of how cycle detection works, as this is turning
out to be a "solve the halting problem" kind of problem!)

Modified:
    Trellis/peak/events/stm.py
    Trellis/peak/events/trellis.py
    Trellis/test_trellis.py