DOC: Add Notes section to chebwin docstring
changing the doc strings of measurements.sum
correcting the measurements.sum() doc strings
ENH: expose control truncation of ndimage.gaussian_filter().

This change gives the user control over the size at which the Gaussian filter is truncated,
with default behavior to truncate at 4 standard deviations (the previous fixed value).
ENH: Pass extra keyword arguments to gaussian_laplace() and gaussian_gradient_magnitude() to gaussian_filter()

This change allows control over the truncation radius of the gaussian filter used in
gaussian_laplace() and gaussian_gradient_magnitude().
TST: ndimage: add more tests in test_gaussian_truncate()
small changes in the description of class hypergeom_gen
DOC: use raw docstring so math doesn't need double backslashes
Perform some geometric RV computations in log space to increase
accuracy.

Add tests for logcdf, logsf and ppf geom RV functions.
MAINT: replace internal calls to `norm.pdf` with _norm_pdf
to avoid the public function call overhead. Closes gh-1710
Fixing Issue #2720

Fixing wrong docstring of dct function (Type III, norm=ortho)
https://github.com/scipy/scipy/issues/2720
FIX: raise NotImplementedError, not NotImplemented

or else raising this error raises an error:

TypeError: 'NotImplementedType' object is not callable
Comment: NotImplemented is returned, while NotImplementedError is raised
FIX: raise NotImplementedError, not NotImplemented
Revert "BLD: special: fix build when system doesn't have isfinite macro"

This fix broke windows builds.

This reverts commit 091e6fc93d90a9c63ecdbab2bbbee1673902eb1f.
BUG: fix build on RH5.
MAINT: signal: Some clean up in _peak_finding.py:

* Fixed the description of the return value of argrelmin, argrelmax,
  argrelextrema and _boolrelextream.
* Fixed the example in the docstring of _boolrelextream.
* Added examples to the docstrings of argrelmin, argrelmax and
  argrelextrema.
* Added more tests for argrelmin and argrelmax.
* Removed some commented-out code and unused imports from test_peak_finding.py
  along with an unused variable (num_peaks) in _gen_gaussians().
* Removed an argument ('order=2') from the signature of
  TestArgrel.test_higher_order() in test_peak_finding.py.
* Removed unnecessary special check in argrelextrema that incorrectly
  returned a length 2 tuple when there were no relative extrema,
  regardless of the dimension of the input.  Fixes gh-2832.
* Several more minor tweaks.
Merge pull request #2819 from jwkvam/geom_log_space

Perform some geometric RV computations in log space to increase accuracy.
Merge pull request #2826 from ClemensFMN/patch-1

Fixing Issue #2720
Merge pull request #2822 from EvgeniBurovski/norm.pdf

replace internal calls to `norm.pdf` with _norm_pdf