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
DOC: update 0.13.0 release notes.
DOC: Add scipy.sparse release notes.
DOC: add authors list to 0.13.0 release notes.

[ci skip]
Turned on fancy indexing tests for CSR
Moved indexing utilities to a mixin class
Line wrap
Added a test that caught a bug in CSC/CSR. Details in master branch.
CSR now inherits from IndexMixin
Fixed CSR[1, 2, 3] bug by  extracting indices using method from IndexMixin in
sputils
Modified issequence so that it only returns true for lists/tuples of
scalars.
Limited the last case for the row = int cases. Instead of being a
catch all for CSR[i, *] it now only catches CSR[i, [j, k, ..]]
Turned off assignment tests for now.
Factored out Boolean check from _index_to_arrays() to put at front of
csr __getitem__()
Added todense() function to test_fancy_indexing_boolean() to deal with
cases where CSR.__getitem__() returns a matrix.
Added check for Boolean input in the front of __getitem__(). Otherise,
asindices() sees the Boolean data as zeros and ones.