scipy.special.orthogonal.p_roots with cache
the mu parameter can also be a float
ENH: release GIL for filter and interpolation of ndimage

allows using python threads for parallization of indepent operations.
Revert "the mu parameter can also be a float"

This reverts commit 48674c2835861a2ce6a663f94fbc95f5cccdd663.
Revert "scipy.special.orthogonal.p_roots with cache"

This reverts commit 431133df5340c923dc4887d570faf01370869a8a.
_cached_p_roots for speeding up quadrature
TST: integrate: Remove an invalid test of odeint.

In a test of the use of the banded jacobian arguments
of scipy.integrate.odeint, there is a check that two
different calls to odeint result in the same number
of jacobian evaluations at each step.  In one call,
the banded jacobian arguments are not used.  This is
an overly optimistic test; we can't really be sure that
the number of jacobian calls will be the same in these
two cases.
FIX: Raise value error if window data-type is unsupported

Added unittest. (I had to derive the Test class from unittest.TestCase to use
self.asserRaises. This had no effect on the other tests of this class as they
use numpys test assertions. The number of executed tests was unchanged.
Fixes #3603
Replaced unittest.AssertRaises with numpy equivalent.
TST: sparse: remove known failure that doesn't fail
TST: switch from Rackspace wheelhouse to numpy/cython source installs.

The Wheelhouse seems to have frequent connectivity issues, and
building Numpy and Cython only takes a couple of minutes.

See gh-3883.
DOC: stats: Small formatting correction to the 'chi' distribution docstring.
Merge pull request #3952 from WarrenWeckesser/doc-stats-chi

DOC: stats: Small formatting correction to the 'chi' distribution docstring
DOC: stats: fix spelling of 'Saunders' in 'Birnbaum-Saunders', and add reference.
DOC: stats: fix typo in the module docstring.
DOC: stats: fix isf docstring: isf is not 1-sf.
DOC: stats: Change layout of the beta PDF formula.
DOC: stats: fix typo in powerlaw distribution docstring.
Merge pull request #3953 from WarrenWeckesser/doc-stats-corrections

DOC: stats: Several corrections and small additions to docstrings.
signal.__init__.py: remove duplicated `get_window` entry