matplotlib Code

Numpification new try: dont touch numerix/, but make mpl code independent of it.
(Including conversion to "import numpy as npy")
Complete except for pylab.py and mlab.py

reverted numerix breakage, with apologies

completed numpification of most trivial cases

remove trailing spaces

a tkagg svg print fix

some polar fixes

added new pick event infrastructure

removed generator expression from mathtext2

added per canvas widget locking

added lasso widget