support 3d plots in arbitrary axes; thanks Ben Root
set_xlim, set_ylim accept descriptive kwargs: left, right, bottom, top
Remove experimental config subpackage using traits
tkagg and fltkagg backends now have blocking show() like all the others
Applied Ben's rotate button patch for axes3d
applied Ben's mplconfig patch
fix new bugs in handling of xlim, ylim, margins
colorbar: use pcolormesh instead of pcolor, to reduce artifacts
Clean up docstring of restore_region().
tick_params works with existing ticks instead of starting with new ones
