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: 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 sparse: Add Ellipsis indexing to sparse matrices.
TST sparse: Add tests Ellipsis indexing with sparse matrices.
enhanced one example
Fixed issue #2720 in tutorial
MAINT: attempt debugging some code that behaves differently on different LAPACKs
DOC: remove an obsolete file
MAINT: disable a test that involves singular matrices and which seems to not be stable across different LAPACKs
Merge pull request #2768 from argriffing/lax-fractional-matrix-power-singularity

TST: mark a fractional_matrix_power test as knownfail
REL: set version of master to 0.14.0-dev, add 0.14.0 release notes.