matplotlib Code

Deal with font tags (\cal \it \rm etc.) more like TeX

Minor cleanup and simplifications. Handle sub/superscript as a unary operator.

Got nested sub/superscripts working. Improved formatting of grammar
to be more readable to newbies (like me).

fixed a formatting bug in ticker.ScalarFormatter (10^0 was rendered as
10 in some cases)

Fix ttconv so it can handle fontmeta with newlines in it

Updated pyparsing to latest stable version (1.4.6) and updating
mathtext to support it.

Cleaned up setup.py. Removed references to Python 2.2, distutils.

Improved docstring for matplotlib package

Don't release mouse unless it is captured

Improved docstrings, mainly annotate, base pylab