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.
DOC: fix link to FITPACK library
MAINT: replace internal calls to `norm.pdf` with _norm_pdf
to avoid the public function call overhead. Closes gh-1710
DOC: remove references to 2d spline function from 1d section
Fixing Issue #2720

Fixing wrong docstring of dct function (Type III, norm=ortho)
https://github.com/scipy/scipy/issues/2720
Merge pull request #2820 from andreas-h/fitpack_link

DOC: interpolate: fix link to FITPACK library
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
DOC: sparse: fixed a spelling mistake in the 'sparse.rand' docstring.
TST: add the Burkardt test matrices for the matrix exponential
MAINT: math.expm1 -> np.expm1 hoping for compatibility with old python/numpy