Bug#835397: transition: superlu soname 4 -> 5

[Sebastiaan Couwenberg <sebastic@xs4all.nl>]

This transition is complicated by being intertwined with the openmpi
transition.

The getfem++ & petsc build dependencies cannot be installed until
scalapack is rebuilt with openmpi 2.0, unfortunately scalapack FTBFS due
to test failures (#837062) which need to be resolved first.

And the slepc build dependencies cannot be installed until petsc is
rebuilt with openmpi.

pysparse (1.1-2) FTBFS due to an incompatibility with superlu 5.2.1:

 Src/superlu3module.c:270:3: error: too few arguments to function 'dgstrf'
    dgstrf(&self->options, &AC, relax, panel_size,
    ^~~~~~

This was already reported in #836677, whose severity has now been
increased to serious.

Kind Regards,

Bas

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