matplotlib Code

Fix autoscaling problems associated with axhline etc.

Added a method to class Transforms in transform.py that transforms
angles. The generic method uses a generic algorithm involving pushing
off from a group of locations to determine new angles. This should
work with almost any transform, but much quicker algorithms can be
found for affine transforms. These algorithms have not yet been added
though, so the generic method will be used until they are.

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.

Make transforms.nonsingular handle inf and nan sensibly.
Without this, trying to plot a line with all data masked would
raise an exception via the autoscaling.

More docs progress.

Improve auto-generated property tables to have links from the name of the property to the setter method. This is useful since many properties are not self-explanatory from their "ACCEPTS" list alone.
Parse multi-line "ACCEPTS" statements in docstrings.
Clean-up markup in FancyBoxPatch and related classes.
Syntax highlight ipython session example.
Judicious use of "seealso::"
Lots of grammatical and capitalization clean-up

Fix all Python 2.6 deprecation warnings.

Enhancement to Axes.spy, and bugfixes:
figlegend was not plotting markers;
plot could not handle empty input arrays.

Fix numpy namespace (thanks Evan Mason)

Eliminate duplicate Path instantiation