Matrix redistribute

See merge request !31

Fixes

See merge request !30

The old code crashes when calling an MPI_Allreduce. The reason is that
part of the input array (t_tmp in this case) is not initialized.

Due to an error, on systems where AVX-2 (FMA) was supported, also
the "pure" AVX kernels used FMA instructions. This has been fixed
now

If a C program needs an underscore to link against a Fortran library
append it, otherwise not

Merge branch 'matrix_redistribute' of https://gitlab.mpcdf.mpg.de/elpa/elpa into matrix_redistribute

Elpa gpu pinned

See merge request !28