Add '-m64' to the compilation line under win64

Better error msg and test reshape in the not contiguous case.

Make MRG random generator raise an error when there is bad size gived.

Fix for potential crash due to concurrent jobs

Installation instructions, and test fixes, for windows

I corrected what I thought was a typo in a previous pep8 commit,
but this change was also needed for the test to make sense.

That is basically what numpy does, and it is necessary under win64,
since all shapes are composed of long, not int.

Pep8

Crash size 0

Yet another size fix

Minor stuff

enable_sparse is indeed a Boolean

Fix composite new inputs