- Sync SLE and openSUSE builds (jsc#SLE-12162).

- Update to version 6.1.0. The change in release number reflects a change
in behavior of the software, regarding two features:
* Algorithms for sparse matrix reordering now fully take into account vertex
weights. While the previous versions only accounted for them in the nested
dissection method to compute and optimize separator size/weight, they are
now also accounted for in the minimum degree and minimum fill algorithms.
Consequently, vertex amalgamation can be tuned so that the size of
(column-)blocks is tailored according to the real amount of computation to
be performed on supervariables.
The esmumps interface with MUMPS has been updated so as to take into
account this new feature.
* The routines of the vertex graph partitioning (with overlap) module have
been redesigned, leading to much smaller run time and, most often, higher
quality
- Scotch development is moving to gitlab
- Add support for gcc10 and build support for openmpi4.