more tests to test differently-aligned thread slices
Makefile.PL uses different quotes to pacify windows
more accuracy in the reference values in the slice alignment test
I now plan for the worst-aligned thread slice

I currently compute one plan for all my thread slices. Since the slices could
have differing alignment, I make sure to generate the plan for the worst-aligned
slice.
slurping files myself (instead of using the shell)

this increases portability
I now make Alien::FFTW3 required for building dev snapshots

This is a compromise that should allow testing Alien::FFTW3 logic for those who
want it, while staying out of the way for distro packagers.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Makefile.PL

Keep the new regex detection for gcc
Use NUM2PTR( any , val ) to perform safe typecasts

Otherwise you get warnings and possible problems for systems
where the sizeof(void*) is not equal to the ivsize.