matplotlib Code

Fix message about wxAgg version requirement.

Fix the parser so it doesn't silently fail. Speed up by using
pyparsing's packrat feature.

Making parser more robust -- will only accept valid symbol names.
(Re-)adding \hspace{ } command.

Fix docstring

Prevent the mathtext cache from getting out of hand, by clearing it
after every plot.

Fix capitalization of "Pdf", which must match that in matplotlib/__init__.py

fix verbose reporting with traited config

Change mathtext.* rcParams so they accept a string which is a set of
arguments to the FontProperties constructor. This has been added to
both the classic and traits based configuration frameworks.

sync tconfig.py with sources in ipython1

Take a version check out of the method call. Thanks to Fernando Perez.