matplotlib Code

refactored affines abd artists

Missing npy.concatenate post numpification

A few more changes in examples

examples/* updates from Stefan van der Walt

Allow application to remove artists from the axes

Got glue working, as demonstrated by frac

Fix bug where some characters would be missing from the font on
subsequent Ps or Pdf plots.

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

affines are first class objects

First pass with a real TeX box model. Lots of things broken -- just
want to mark this spot in the revision history.