matplotlib Code

Updated the FAQ: Q:how to make SVG viewers properly display mathtext equations (A:install fonts or embed them in the SVG file)

Remove unused lines of code.

Fix handling of font file matching so that if two different paths point
to the same file, they are treated as the same file.

First commit of code to embed fonts as paths in SVG files.

Added linespacing kwarg to text

Numpification and partial cleanup of dates.py

Warn when TTF contains an unknown transformation type in a composite character.

Removing extraneous comma. (Oops).

Add TTF subsetting to backend_pdf.py.

Include <assert.h> for newer compilers