MUMPS and other imminent upgrades

[Drew Parsons <dparsons@debian.org>]

Hi Graham, once stretch is clear I want to push the new version of
MUMPS to unstable.  Just letting you know and Debian Science know in
case we need to worry about trilinos during the transition.

I first want to wait until the current versions of blacs/scalapack 1.18
, dolfin 2016.2, petsc4py/slec4py (python3 support) drop into testing
(to give a reference point making it simpler for possible entry into
point releases of stretch in the future, without major library version
upgrades).

HYPRE is due for an update, but I figure we might as well wait till
1.12.1 is released (probably another month or so). It will have GPU
support.

Minor upgrades at hand for PETSc and SLEPc.

fenics/dolfin 2017.1 will go to experimental soon, then will push to
unstable after the new mumps.

Drew