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.
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.
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
more edits
move intended usage section after motivation
add negative power support to @@
ENH: Make output of get_atlas_info conditional on system_info.verbosity
MAINT (API?): organize npyio.recfromcsv defaults

Organizes the default kwargs in recfromcsv. Changes two undocumented
kwargs behaviors:

*  previously, if a user set `names=None`, it was ignored and replaced
   with `names=True`
*  the `dtype` kwarg was ignored. If `update` was given, it was used as
   `dtype`, and if not, None was used. We can retain the `update` behavior
 by using `kwargs.setdefault("dtype",kwargs.get('update', None))`.
  This Closes #311 .
TST: Added regression test for recfromcsv dtype error, as suggested by @hpaulj
DOC: npyio.recfromcsv keyword argument changes

Added a note to recfromcsv about the `dtype` keyword,
as suggested by @hpaulj. Also added a note to the release notes,
about the change in the `update` keyword, as suggested by @charris.
MAINT: Remove doc/cython and doc/pyrex files.

Pyrex is obsolete and cython does a good job with Numpy these days.
These directories are not packages, so I don't think they need
deprecation.

Closes #4373.
DOC: Document removal of doc/pyrex and doc/cython directories.