matplotlib Code

removed empty datetime example from test_axes; now in test_dates

testing: fixup failing jpl unit test infrastructure

testing: add missing file

testing: enable test_dates

testing: convert some JPL units tests to simple nose tests

testing: move baseline images

testing: move test/mplTest/units to lib/matplotlib/testing/jpl_units

testing: baseline images now in svn. specify image names without '.png'

testing: set backend to Agg only once

testing: move baseline image