matplotlib Code

More command-line options for memleak_gui.py

Patch by Mike Droettboom, tracker 1745408, fix mem leak in wx
https://sourceforge.net/tracker/index.php?func=detail&aid=1745408&group_id=80706&atid=560722

tiny fix to example code

fix some C compilation warnings

changelog entry

refactored negative_linestyle option validation

general cleanup of newly created rcdefaults.py file

added rcdefaults.py

Applied memleak patch from Mike Droettboom, tracker 1745406
http://sourceforge.net/tracker/index.php?func=detail&aid=1745406&group_id=80706&atid=560722

split out rcdefaults and validation code into separate file rcdefaults.py