ENH: ma.asarray() and ma.asanyarray() will pass through input of the correct type.

If x is of type MaskedArray for ma.asarray(x) or any subtype of
MaskedArray for ma.asanyarray(x), these functions will simply return x.
This makes them consistent with their numpy counterparts.

Closes gh-4043.
BUG: Fixed mask_rowcols().

Previous implementation relied on ma.asarray() to always create
a new object.

See gh-4043.
Fix histogramdd treatment of events at rightmost binedge

Fixes Github issue #4266
BUG: Make interp return NaN at NaN interpolation points.

A NaN interpolation point was interpreted as out of bounds on the left
side, hence the value of the left parameter in the function call was
returned.

>>> np.interp(np.nan, [-10, 10], [-2, 2])
-2.0

NaN is a better choice.

Closes #605.
MAINT: #2312, Make all tofile failures raise IOError.

Fix two that were raising ValueError instead.
Make some style cleanups.

Closes #2312.
DOC: Document tofile exception changes in 1.9.0 release notes.
numpy.i bugfix: fortran ordering check

for ARGOUTVIEWM?_FARRAY[34] typemaps, the included require_fortran check was inverted -- failing if the resulting array had fortran ordering, not if it did not.  This modification inverts these checks.
BUG: Fix broadcasting in np.cross (solves #2624)

Changed np.cross to move the axis it's operating on to the end, not the
beginning of the shape tuple, and used rollaxis, not swapaxes, so that
normal broadcasting rules apply.
There were no tests in place, so I added some validation of results and
broadcasted shapes, including the one reported in #2624
TST: Added out of bounds axis checking to the tests.
ENH: Minimize temporary intermediate arrays using a preallocated
     output array and in-place operations.
DOC: Added 'Supports full broadcasting' note to the docstring.
BUG: get_info('openblas') does not read libraries key

The documented libraries tag in the site.cfg is not read by the configuration,
instead openblas_libs is used, this is inconsistent with atlas configuration.
So libraries first and then try openblas_libs for backward compatibility.

Also ensure check_libs returns None instead of a dict of empty lists if
nothing is found.
DOC: update openblas fork warning with fixed pthread build info
initial commit of new infix matrix multiply PEP
Many updates to draft PEP incorporating feedback
add mention of ellipsis
bold the 'dot' row of table
more table format tweaking. too bad .rst sucks at this!
switch to just use text for the table, it's easier to read!
more text tweaks
tweak tweak
DOC: Added note to 1.9.0 release notes