matplotlib Code

removed unnecessary fix-cm and scalefnt latex package requirements from texmanager

improved usetex to respect serif, sans-serif, monospace, and cursive rc settings

Changed ticker.AutoLocator to use MaxNLocator.

one more fix for font cacheing

include font.family information in tex's cache

fixed uneven gridline bug

Added MaxNLocator to ticker.py; changed contour to use it by default;
made a few other cleanups. The prototype for the behavior of the
new locator was provided by Rob Knight.

allow alternative font families in ps output when using tex backend

trivial shortening of source code line lengths to fit terminal window.

buffered processing of matplotlib rc settings, in order to allow
verbose.report during rc validation