matplotlib Code

remove generator expressions from texmanager and mpltraits

fix typo.

Fixed an error in calculating the mid-point of a bar since the values are now lists and not arrays, they need to be iterated to perform the arithmetic.

Fixed a typo in the Ellipse code that was causing the ellipse angle to go in the wrong direction. When I was testing I had forgotten to turn off the axes inversion test.

Tweaked automatic contour level calculation

Minor cleanup of arguments and docstring in contour

axes.py: Reverted get/set xlim/ylim methods to original state
Added get/set xbound/ybound to handle axes inversion maintenance
Removed inverted axes flags
patches.py: Added some logic to xform an Ellipse angle as per the Ellipse's transformation.

Fix for "NameError: global name 'ones' is not defined"

Merged from trunk (a somewhat hairy manual merge this time). Fixed
bug (on this branch only) where inverted axes were broken.

Progress on agg_buffer_to_array example.