matplotlib Code

some fixes for osx builds on rc2

Remove unused argument from data_init in cntr.c

Elimination of contourf cut strokes: second try

Fix indentation error in mpl_data_demo.py - thanks to Gökhan Sever

Made cbook.get_mpl_data make use of the ETag and Last-Modified headers of mod_dav_svn.

attach gtk events to mpl events -- fixes sf bug 2816580

Disable contourf slit line removal until problems are fixed.

minor tweak to legend picking example

Fix typo in recent change to contour.py.
(There are still bugs to be found in the change to cntr.c.)

Tweak legend_picking.py demo to change alpha of lines in legend.