First attempt at BF for 2028 and added better tests for scalarmath pow function
fixed some style problems
BUG: Do not reuse nditer buffers when not filled enough.

This checks if the previous time around, the buffers were filled
with as much data as they would be filled this time around. Since
This is difficult for the initial loop before reusing is activated
because in that case the buffer may be larger then just the
first outer reduce dimension. In that case do not allow reuse
unless the index along that dimension was 0.
When the inner reduce index is not 0, then also the reusing of
the buffer is dangerous.
TST: Add (slow) nditer reduce buffer reuse test
BUG: no buffer reuse in nditer, if there was no buffer previously

If the buffer is used or not can possible change during iteration.
In this case, the buffer cannot be reused if it never existed...
TST: test no reuse of non-existing buffers in nditer

This slightly changes the test to cover more cases including
the one where buffers are sometimes used and sometimes not.
Update scalarmathmodule.c.src

Got rid of some white space in scalarmathmodule.c.src
Merge pull request #3187 from ericfode/float16pow

Float16pow
REL: Release 1.7.1
BUG: Backport #3188, Fix numpy.void pickling.

During call to PyArray_scalar a PyVoidScalarObject is created, and it's
obval field set to a newly allocated block of memory of the correct item
size. With a null base member, the subsequent call to copyswap can not
determine an item size and returns without copying.  Adding direct copy
of input data if no base is provided, as no swap is required.

Adding regression test for constructor and original pickle repro case.
Merge pull request #3186 from seberg/backport-issue-3142

Backport nditer buffer reuse fixes
replace exec by eval to ensure the c variable is defined for all relevant python versions
Merge pull request #3230 from jdkloe/1.7.x

Fix for issue 3192 - backport of f31f0fbe45
BUG: Concatenate with axis None should work regardless of matching array shapes
TST: Add test for concatenate with None-axis

Conflicts:
	numpy/core/tests/test_shape_base.py
Merge pull request #3275 from dieterv77/fix-concat-1.7.x

Backport fix for np.concatenate with axis=None
Fix for astype('S') string truncate issue

Calling astype('S') for an array of string objects results in a string array where dtype='S64', even if the original string objects are longer than 64 characters. Add call to GetParamsFromObject() to determine maximum string object length, and use that as string dtype size.
Add support for unicode strings
Add tests for strings shorter than 64 characters
MAINT: Fix tests for 2to3 and Python < 2.6.

Use asbytes instead of 'b' and the 'u' string prefix instead of sixu.