Deleted obsolete memleak_transforms.py
renamed anim to reflect tk
fixed anim.py to use tk idiom
support mouse wheel in wx
Fixing edge cases in rec_join in branch
Fixing edge cases in rec_join
minor cleanup of units example, added some to backend driver, more to be fixed
fixed memleak hawaii rand
dynamic_collection: collection now has private copy of array
nx is no longer a pylab symbol
