Audit Fixmes in numpy/lib, numpy/lib/tests

[charris]

Just so, a task.

[rossbar]

Landed on this issue by a very circuitous route. Though it is almost 6 years old, there still are some fixmes in numpy/lib and numpy/lib/tests:

$ grep -r -i "FIXME" numpy/lib
numpy/lib/recfunctions.py:    # Fixme: nb2 below is never used. Commenting out for pyflakes.
numpy/lib/tests/test_type_check.py:    # Fixme, wrong place, isfinite now ufunc
numpy/lib/tests/test_type_check.py:    # Fixme, wrong place, isinf now ufunc
numpy/lib/tests/test_type_check.py:        # Fixme
numpy/lib/tests/test_format.py:    # Fixme: used to crash on windows
numpy/lib/tests/test_io.py:    #FIXME: Is this still true?
numpy/lib/tests/test_recfunctions.py:        # Fixme, this test looks incomplete and broken
numpy/lib/tests/test_recfunctions.py:        # Fixme, this test is broken
numpy/lib/npyio.py:        # FIXME: This seems like it will copy strings around
numpy/lib/npyio.py:        # Fixme: possible error as following variable never used.

Documenting here if for no other reason than to bump the existence of this issue.