matplotlib Code

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

Applied TkAgg memleak patch by Mike Droettboom, tracker 1745400
https://sourceforge.net/tracker/index.php?func=detail&aid=1745400&group_id=80706&atid=560722

changelog entry

code reorganization to remove active call to 'get_data_path' from otherwise static list of rcdefault values

split dependency check from option validation of usetex

split dependency check from option validation of ps_distiller

cosmetic cleanup of option validation code

simplified option validation using the generic ValidateInStrings where possible

split setting of verbose mode from option validation code

refactored matplotlibrc-file parser