fixed some bugs in BPyMesh_redux, tweaked to work well for test cases. much better use of error levels for edge weighting. better collapsing to the desired target. triangulates before reduction be default now.
* Much improved, slower edge collapse weighting method that makes this script about 2.5x slower, but brings it up to the quality of qslim (lightwave's decimator), without the manifold' errors.
Probably worth adding a UI front end to this function.
Isnt intended to be ultra high quality, more for automatic realtime "Level of Detail" model generation.
BPyMesh.redux(ob, 0.5) # To reduce to about half the polys
