Still requires the more conservative __index__ here rather than a possibly
truncating __int__ because this is used in a context where floating point
values should probably be treated specially.

This fixes Github issue #2752.

Reduce warning level in MSVC again since /W4 turns out to be excessive (complains about constant conditionals, for example).

Closes #2736.

Increase warning level in appveyor builds (could also use "/Wall", but let's see how spammy /W4 is).

Closes #2731.

Closes #2671.

Closes #2729.

Fill shape when PyBUF_ND is in the flags

Closes #2664.

ENH: add no-capture option to runtests to allow debugging srctree tests

Plus Start filling unit test cases

“It have”-> “it has”
“Parralelism” -> “parallelism”

Fix/pythran power