Refactor step handling in slice_memviewslice() utility code to make it more obvious what is happening in which case. Closes GH-3568.
Refactor step handling in slice_memviewslice() utility code to make it more obvious what is happening in which case.
Closes GH-3568.

da-woods/cython,scoder/cython,cython/cython,da-woods/cython,cython/cython,scoder/cython,cython/cython,da-woods/cython,scoder/cython,scoder/cython,cython/cython,da-woods/cython