matplotlib Code

Fix bug where some the images of some math expressions were truncated
at the edges when using Agg backend.

Better mathtext error messages. Fix bug when using \sqrt without
explicit root.

Cleaned up some comments.

Fix \sqrt (broken when I made the parser more strict).

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.

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

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.

Remove a Unicode character

Use pickle to cache entire fontManager instance.
Call font_manager.findfont() instead of font_manager.fontManager.findfont().