matplotlib Code

Create path_cleanup code for use by the Mac OS-X backend. Refactor C++ code to follow Numpy's guidelines for linking multiple C files into a single extension. Remove dependency of Agg backend on _image.cpp and _ft2font.cpp (simplifies linking problems and reduces generated code size).

suppress gcc-4.3 warnings

fixed from_images to respect stride

Allocate acols, arows only if needed; change suggested by Mike D.
Other slight cleanups in _image.cpp.

Bilinear interp in NonUniformImage; slightly modified patch by Gregory Lielens
Includes a bugfix in _image.pcolor2.
Replaced pylab_examples/pcolor_nonuniform.py with the more
aptly-named image_nonuniform.py, modified it to show both
interpolation types, and added it to backend_driver.py.

removed screen noise comments from gtkagg and image since I no longer consider this to be a bug

Add some range checking based on testing in Fusil.

[ 2014183 ] multiple imshow() causes gray edges

added origin support for composite images

Fix some mathtext scaling bugs
Add new mathtext symbols
Use mathtext to render math in the docs (the dog-fooding patch!)
Move PNG reading/writing to its own module and remove it from
_backend_agg and _image