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

converted many non-numpy relicts

added configurable option legend.loc

Applied Paul's pick restructure pick contains patch

Simplified internal code of _auto_legend_data

some polar fixes

added some test cases for legend

Fixed legend and LineCollection to work together again