MAINT: Fix problems noted by pyflakes in numpy/lib/tests.
STY: PEP8 compliance for numpy/lib/tests.

The possibly controversial part of this is making the nested array
value lists PEP8 compliant, as there is something to be said aligning
the values for clarity. In the end, it seemed like the easiest thing
to do was to make them PEP8 compliant. The eye can get used to that.
MAINT: Fixes for problems in numpy/lib revealed by pyflakes.

Some of those problems look like potential coding errors. In those
cases a Fixme comment was made and the offending code, usually an
unused variable, was commented out.
STY: Make files in numpy/lib PEP8 compliant.

The rules enforced are the same as those used for scipy.