findfont(...) will never return None unless fallback_to_default=False
is passed -- the default is True and causes afm searches to fall
back to Helvetica -- so the "filename is None" branch never occurs.
(The code in the pdf/ps backends came in in af9954d4 (2009) whereas
fallback_to_default only came in in 94120dc6 (2010).)

Bump minimal numpy version to 1.12.

Hide sphinx-gallery config comments

Remove interpolation="nearest" from most examples.

Don't mention tcl in tkagg commments anymore.

... as we don't rely on any Tcl_* functions anymore.

MNT: Simplify tk loader.

Simplify axes_pad handling in axes_grid.

Fix some broken links.

DOC: remove ajax from searchindex loading

AFAICT the sf issue links have been lost forever -- I can't find an
archive of them *anywhere*.  So just turn them into plain text by
prepending a backslash.

Update some links

Remove mention of Enthought Canopy from the docs.

Remove outdated license files.

LICENSE_PAINT covered the old libpng interface which has been replaced
by a dependency on Pillow.

LICENSE_enthought dates back to when Matplotlib had a dependency on
Enthought traits, which has been stripped out years ago.

We don't need to load tcl function pointers anymore; everything now
comes from tk's shared library so the shared object search is also
simpler.

Also remove some more remnants of the now-removed tcl-based
command: IMG_FORMAT, BBOX_FORMAT, TkappObject.

Docstring for Artist.mouseover

The link www.enthought.com/products/canopy is broken, googling doesn't
show anything recent, and the apparently official docs at
http://docs.enthought.com/canopy/ say that canopy only supports Py2.7
and 3.5, neither of which we support anymore.

Reword docs accordingly, and at the same time subsume mentions of
Continuum into Anaconda
(https://www.anaconda.com/continuum-analytics-officially-becomes-anaconda/).

- Replace _extend_axes_pad by np.broadcast_to(..., 2).
- Get rid of the unused _axes_pad attribute.

Simplify axes_grid.Grid/axes_grid.ImageGrid construction.

Hopefully a more future-proof fix, removing the dependency on ajax and
searchtools.js altogether. (After loading, searchindex.js itself does
depend on searchtools.js, but both are updated with the version of
sphinx that is used, unlike this template.)

Because the script is loaded with `defer` and also right at the end of
the body, the size of searchindex.js should not block loading the rest
of the page (one of the arguments for using ajax).

Docstring modification after suggestion from Tim Hoffmann.

Remove some commented-out code from axes_grid.

Cleaning the offending trailing white space.

Co-Authored-By: David Stansby <dstansby@gmail.com>

Fix examples claiming matplotlib can't plot np.datetime64.

This is simply not true anymore, they are natively handled.

It is now the default interpolation method (well, actually the default
is "antialiased" but for the cases here they're the same).

The explicit kwarg was left for examples actually illustrating the
interpolation kwarg.

Numpy 1.12 was released in January 2017
(https://github.com/numpy/numpy/tags?after=v1.12.1), which will be more
than 3y ago when mpl3.3 will be released, so it's fine to depend on it
per the dependency policy.

Numpy 1.12 added pathlib support for numpy.load, a minor convenience for
improving cbook.get_sample_data.

Add note to hist docstring about speed

The visibility-handling is handled by toggle(); the other changes are
handled by the lines just below.

Store axes in a 2D, None-initialized numpy array (`axes_array`) rather
than nested lists (converting everything to nested lists with tolist()
at the end for backcompat); this allows one to get rid of self._refax/
self._column_refax/self._row_refax and instead just use
`axes_array[0, 0]`/`axes_array[0, col]`/`axes_array[row, 0]` as axes for
sharing (these default correctly to None on the first iteration).

Minor cleanups: use check_in_list; factor out common kwargs when
constructing self._divider; directly construct self.cbar_axes as a list
comprehension.

Note that the Grid and AxesGrid constructors are almost duplicate of one
another and could be deduplicated later.

Fix invalid checks for axes_class parameter in ImageGrid.

Deprecate "U" mode passed to cbook.to_filehandle().

It has had no effect ever since transition to Py3, and the corresponding
feature in open() is being removed in cpython 3.9.