matplotlib Code

contouring: fix various bugs

Expose tolerance argument to image_comparison decorator. Use it to raise the tolerance for the test_figimage test.

dates: DateLocator.nonsingular checks for near-singularity.
Also fixed fill_units test and baseline files

axes: fix autoscale_view for test_axes/single_date test, and update
test output.

In the old version, single_date was behaving as if tight autoscaling
were in effect; now it puts the viewLim on tick marks.

axes: set _tight default to False; restore previous nonsingular expander

Remove unused import.

Make the TimerBase start/stop implementations just simple pass instead of raising NotImplementedError. This allows creating the timers for BackendAgg, which can simplify some cases.

hexbin tests: change to a sane baseline

coding_guide: add instructions for running a single test (from Mike D.)

Pass strings to FT2Font -- never Unicode strings.