MAINT: Make useless imports of oldnumeric and numarray safe.

The oldnumeric and numarray packages were removed in numpy 1.9, but
some packages, e.g. scipy, import them even though they are not used.
This defines both to the string 'removed' in numpy/__init__.py, which
avoids an import error.
BUG: core: consider both C and F order buffers as contiguous
Merge pull request #3827 from pv/fix-gh-3796

BUG: core: consider both C and F order buffers as contiguous
BUG: fix small issues found with cppcheck

uninitialized use in _strided_to_strided_one_to_n_with_finish
wrong error NULL checks in PyArray_MapIterNew and einsum_sub_op_from_str
double free and memleak in umath_linalg.c.src init_@lapack_func@
Merge pull request #3832 from juliantaylor/static-issues

BUG: fix small issues found with cppcheck
Merge pull request #3826 from charris/add-oldnumeric-numarray-to_init

MAINT: Make useless imports of oldnumeric and numarray safe.
MAINT: fix another wrong NULL check

silences cppcheck error, not a bug as the only caller checks the python
error.
Merge pull request #3838 from juliantaylor/null-fix

MAINT: fix another wrong NULL check
DOC: mention new comparison runtime warnings in release notes
DOC: move support for large files to features

its nothing you should need to worry about when porting to 1.8
DOC: update percentile release notes and add np.array improvement
DOC: minor rewording of partition note
Merge pull request #3841 from juliantaylor/rnotes-master

update 1.9 release notes and sync 1.8 notes with maintenance branch