MAINT: fitpack: trim down compiler warnings (unused labels, variables)
BUG: make matlab happy with empty sparse arrays

Closes gh-4208
TST: add test for empty sparse matrix write

Check that writing empty sparse uses max nnz of 1.
DOC: fix several Sphinx warnings when building the docs

patch developed with Dmitrijs Milajevs and Ioannis Tziakos
DOC: change example sample spacing

Change the sample spacing in the example so the linear interpolation points line up with the original points
BUG: sparse: work around alignment issue in f2py in Numpy 1.9.1

This version of Numpy specifies complex dtype alignments that are not
guaranteed by system malloc on win32, so that np.zeros does not produce
sufficiently aligned arrays.

Work around this issue by using an aligned allocator for intent(inout)
arrays that are potentially complex valued.
TST: bump test tolerances
DOC remove `` from loadarff docstring

They were showing up in
http://docs.scipy.org/doc/scipy/reference/generated/scipy.io.arff.loadarff.html
MAINT remove (commented-out) testing code from the ARFF reader

Wasn't working anyway, because the "floupi" function doesn't exist.
Also referred to a file that is not shipped with SciPy.
TST: bump more test tolerances
Merge pull request #4243 from pv/bump-tol

TST: bump test tolerances
Merge pull request #4245 from larsmans/arff-fixes

Arff fixes
MAINT: remove some unused code from multipack.h headers.

Pretty much the same code in integrate and interpolate.
MAINT: remove unused check_args function from odrpack.
BUG: optimize: fix issue with incorrect use of closure for slsqp.

Closes gh-4240.
Merge pull request #4248 from rgommers/fix-slsqp-issue-4240

BUG: optimize: fix issue with incorrect use of closure for slsqp.
Merge pull request #4212 from matthew-brett/test-sparse-patch

MRG:fix for gh-4208
Merge pull request #4241 from pv/f2py-aligned-alloc

BUG: sparse: work around alignment issue in f2py in Numpy 1.9.1
Merge pull request #4116 from ev-br/fitpack_warns

MAINT: fitpack: trim down compiler warnings (unused labels, variables)
BUG: linalg: Remove a couple shadowed (and buggy) tests from test_decomp.py.