matplotlib Code

updated users_guide.tex to mention numpy, qtagg backend,
new location of matplotlibrc files, and changes to the
process (numerix does not have to be selected at build
time, etc).

Use pslatex package for nice adobe fonts, use bookmarks
and colorlinks options for the hyperref package.

Removed figures from version control which are created
when make is run.

fixed a bug in ScalarFormatter

fixed numeric xerr/yerr bar bug

added a short format string

added julian date converters

fixed a numpy typecode bug in colors

fixed ellipse drawing

added widget locking to lasso and pan/zoom

Added ellipse patch

Added ellipse patch