matplotlib Code

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.

fixed a load numpification bug

Fix segfault in FT2Font::clear()

Fix over-allocation of alpha-channel buffer. (Reduces memory usage
with Agg by ~25%

Add a helpful comment.

fixed qt version reporting in setupext.py

Fix refactoring bug.

added missing import statement to config/rcparams.py