matplotlib Code

commented out seterr in npy -- ma looks broken here

Remove more obsolete files from unit subdirectory

Deleted obsolete memleak_transforms.py

minor cleanup of units example, added some to backend driver, more to be fixed

fixed memleak hawaii rand

Expanded delete_masked_points to handle more types of argument

Moved and modified axes_unit.py to cbook_unit.py.
At present it is only testing delete_masked_points,
which was moved from axes to cbook.

Check for nan and inf in axes.delete_masked_points().

axes was not calling artist set_axes method in set artist props

added manuels scatter pie example