matplotlib Code

Make escaped $ work in non-usetex mode

Fix numerous documentation warnings.

deleted some unused imports, functions.

fixed some doc formatting errors

fixed text docstring

Committed Andrew Straw's patch to support hyperlinks. Currently only the SVG backend, but the infrastructure is there for other backends to support it.

added jae-joons fancy arrow and box patch for annotations

Minor fixes to text docstrings, and to make getters and setters completely symmetric.

Add nearest neighbor search for fonts.

Include output images in examples in documentation.
Add "-*- noplot -*-" markers to examples where we don't want that.
The "plot" documentation directive now takes a path relative to the doc/ directory, not doc/pyplots.