matplotlib Code

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.

Fix docstring formatting in imshow.

Axes.hist: remove unnecessary copying of input array.