matplotlib Code

Modified Tcl procedure registration and command prototype to work around
changes to the command prototype between Tcl8.3 and Tcl8.4.

* Fixed embedding_in_wx and dynamic_demo_wx examples

* Ported build to darwin

* Tk:

removed default figman=None from nav toolbar since it needs the
figman

fixed close bug

small changes to aid darwin build

added matplotlibrc and tk win32 compile fixes

Added files for TkAgg backend. Currently linux only.