matplotlib Code

Removing obsolete branch for mathtext improvements (merged to trunk a long time ago

Fix a couple of backend_svg buglets.
1. Dashed lines did not render properly
2. Resulting SVG was scaled wrong (width and height should be
specified in points, not pixels.)

Clip path support in pdf backend

A more careful reading of the pdf spec reveals that Type 1 fonts
embedded in pdf files are not actually supposed to be in pfa format,
but a similar format where the encrypted part is not encoded in
hexadecimal, and where the "fixed-content" part at the end may be
omitted. This fixes the problems with Preview.app.

Fix typo

Fix typo

Add svgz support to backend_svg and backend_cairo.
Put all styles inside of a separate <style> element in backend_svg, to
save considerably on file size.

Refactoring of FigureCanvas*.print_figure so that each backend does
not have to track all other possible filetypes. This should make it
easier to add new filetype backends without updating lots of places.
All GUI backends have the same base set of filetypes they support,
defined in FigureCanvasBase. Non-GUI backends, for the most part will
still only write to their own file format (and not do any
switch_backend magic.) All GUI backends (where possible) now generate
a list of file patterns for their file chooser dialogs, rather than
having hard-coded lists.

See FILETYPES for matrix of filetypes supported by each backend.

Small bugfix in pdf backend

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.