Fix PEP8 W391 issues (blank line at end of file).
Fix PEP8 E712 issues (comparisons to True).
Misc PEP8 fixes.
Merge pull request #4089 from cbrueffer/pep8

Fixes for various PEP8 issues.
BUG: fix buffer dtype mismatch on win-amd64

ValueError: Buffer dtype mismatch, expected 'Py_ssize_t' but got 'long'
(cherry picked from commit c1f3e25d4a3f58b7e43fcdc0f40cf4c1e8f735a2)
DOC: interpolate: fix ReST issues in interp1d docstring
DOC: interpolate: remove UnivariateSpline methods from the module docstring

Methods are available in the individual *Spline classes
DOC: correct/expand docstrings of *UnivariateSpline class methods.