ENH: Add a 1D Savitzky-Golay filter
DOC: signal: fixed the last example in the docstring for savgol_coeffs
DOC: signal: fixed a typo in the savgol_filter docstring
DOC: signal: fix typo in _fit_edge docstring
BUG: signal: in savgol_filter, properly handle dtypes that are not 32 or 64 bit floating point
ENH: allow sparse __rmul__ to work with custom types
BUG: levene didn't sort before trimming closes #2555
REF: levene test: add random seed
BUG: special: fix asymptotic expansion in rgamma
BUG: special: fix several issues in poch

Handle better the cases where the gamma functions in the definition hit
poles or over/underflow.

Fixes gh-1437
GEN: special: regenerate files
DOC: enhanced fftpack tutorial
DOC: further changes in fftpack tutorial
ENH: refactor mio module imports for greater beauty

Remove unused; use bracket instead of backslash continuation.
API: remove use of find_mat_file and deprecate

Deprecate for removal of utility function in next version
API: raise error for >2D array and Mat4 format

Threatened deprecation now an error.
API: make oned_as='row' default for Mat5

Previously `oned_as='column'` was the default; deprecation threatened
for a long time now.
DOC: add io/matlab changes to release notes
RF: remove `find_mat_file`

Discussed on pull request #2704
RF: remove ``oned_as=None`` option and warnings

Remove None as an option to ``oned_as`` and remove associated warnings.
Discussed on pull request 2704