BUG: Fix typo in hermite_e.py.

The hermepow function was incorrectly listed in __all__ as hermpow.
STY: PEP8 fixes for files in numpy/polynomial.

The rather lax standards used in scipy were used to identify the
needed style fixups.
MAINT: Remove unused variables and imports in numpy/polynomial/*.py.

Detected by pyflakes.
STY: PEP8 fixes for numpy/polynomial/tests/*.py.

Made conformant with the standards of scipy.
MAINT: Fix blemishes in numpy/polynomial/tests revealed by pyflakes.
ENH: better error message for invalid axis and concatenate inputs

the old errors
np.concatenate(1,2)
TypeError: object of type 'int' has no len()

concatenate([1], [2])
TypeError: an integer is required

are not very unhelpful, add a new internal function that allows adding
some context to axis argument conversion failures and check for sequence
inputs in concatenate.
Closes gh-4923.
STY: PEP8 fixups for numpy/random.
BUG: Fix None comparison giving FutureWarning in choice function.

This is in numpy/random/mtrand/mtrand.pyx where the choice function
was using comparisons of the form `None != p`.
DOC: Fix typo in _iotools.py docstring.

The error is in the StringConverter.upgrade docstring.
Merge pull request #4924 from charris/pep8-numpy-polynomial

Pep8 numpy polynomial
Merge pull request #4926 from juliantaylor/concatenate-error

ENH: better error message for invalid axis and concatenate inputs
BUG: fix memoryleaks in datetime dtype parsing

closes gh-4973
closes gh-4974
Merge pull request #4976 from juliantaylor/datetime-memleak

BUG: fix memoryleaks in datetime dtype parsing for 1.9
Merge pull request #4948 from charris/1.9-fix-typo-in-_iotools-docstring

1.9.x fix typo in _iotools.py docstring.
ENH: np.dot: better "matrices not aligned" message
ENH: include shapes in "matrices not aligned" msg

I had to move convert_shape_to_string to common.h so that _dotblas.c
can access it.
BLD: add debug information to gfortran builds

Similar to C builds which always have debug info.
Merge branch 'gfortran-debug' into maintenance/1.9.x
BUG: don't overwrite input percentile arrays
Merge pull request #4989 from juliantaylor/percentile-fix

BUG: don't overwrite input percentile arrays