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Modified MPI one-sided communication. a) simplified code b) made vaiables asynchronous c) try to use allocate instead of MPI_ALLOC_MEM

Resolve SOC problems in CI by restricting use of OMP

See merge request fleur/fleur!14

the leftover SUBCOMM from the 1st variation). For this, abcof was
adapted (now: abcof_soc.F90) to avoid problems with invsat(). Some
indexes changes in hsohelp.F90, so wann_socmat.F was changed as well.