matplotlib Code

Undoing last commit. I don't understand why a gray8 buffer is four
bytes per pixel, but there's a lot I don't understand about Agg.

Fix set_name call.

Fix get_xyz_where() typo so spy_demos works again

Convert to numpy

fixed some minor bugs related to mathtext: text
markup in new config, uncommented print statement

Bugfix #1671570: Invalid CSS 2 styles in SVG output

Fix some recent reference counting bugs in ft2font.cpp (Thanks to Paul Kienzle).

Bugfix #1767997: Zoom to rectangle and home, previous, next buttons

The "original" position of the axes was not being saved/restored in
the history stack. This patch saves both "original" and "active" position.

fixed a load numpification bug

Use cmex for symbols that don't have any equivalent in Unicode (the
vertically sized things, in particular). Simplify fallback_to_cm
code, now that font buffers are handled differently.