matplotlib Code

Removed some unnecessary imports.

Add support for Unicode fonts (char codes > 255) in PDF with Type 3
fonts. (Type 42 fonts were supported as of a preceding commit.)

updated pytz and dateutil to latest upstream versions

Fix mathtext_demo to use markup="tex" kwarg.

Improve horizontal lines in mathtext in Agg backend.

Load characters without hinting for PDF output.

Removing accidentally committed debugging output.

Add support for fonts with more than 256 codepoints in PDF backend.
This currently only works when pdf.fonttype == 42. (It doesn't seem
possible to have a CID-keyed Type 3 font in PDF, so some hacky
solution will have to be developed.)

Improve font manager so default font names like "serif", "sans-serif"
etc. are looked for across all fonts in that mapping, not just a
single hard-coded one.
Add DejaVu fonts as an alternative to Vera fonts if present.
Fix how mathtext non-Computer Modern fonts are specified.

Fix bug with SVG non-math text