Bug#961185: aleph_64

[Drew Parsons]

clone 961185 -1
clone 953116 -2
thanks

MUMPS can enable 64-bit ordering (PORD) and 64-bit PETSc can use that, 
while other integers remain default 32 bit (in BLAS, MPI etc). This is 
the fast&easy® 64-bit build.

Full 64-bit requires 64-bit MPI.

The cloned versions of these bugs will continue to track progress 
towards 64-bit MPI (and other packages).