matplotlib Code

add cla() support for spines

Removed support for gtk < 2.4

Make rcsetup validate_color handle non-string input

fixed a buglet in legend when len(handles)==1 and ncol=2

Updated the record array helper functions to create an empty record array where necessary

Handle overrightarrow and overleftarrow in mathtext like accents.

handle scroll wheel events in Qt4 backend

make default argument to Axes.get_xaxis_transform() not raise error

I made this a separate commit from the previous one because it may be
useful to see the errors that arise if get_xaxis_transform() or
get_yaxis_transform() are called with no arguments. This would allow
one to figure out which code paths are calling these methods and fix
them if needed rather than silently partially succeeding.

Arbitrary spine placement

fix typo