matplotlib Code

Provide way to access STIX "letterlike" symbols using LaTeX font
commands. Add "stixsans" option to typeset math with sans-serif glyphs.

updated dependency report during build process

move configobj.py to lib/, install in site-packages only if required

Make STIX fonts work.

improved ghostscript version checking

rm configtest.py from repository

changed dependency check for ghostscript, which was failing to identify svn
versions

remove generator expressions from texmanager and mpltraits

fix backend_wxagg reference in new config module

Factored plotting part of pylab.py into pyplot.py