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These variables were needed for some MPI parallelization that
has already been removed. In the future it will be replaced by
a new parallelization scheme.

This compiler is a bit picky about some fortran features. In particular it does not like
dummy arguments to be used as dimensions before they are declared...

-removing of variable icorr, use of member-functions instead
-removal of icorrkeys module
-removal of hybridmix module
-cleanup at several places

This is done mainly by adding CPP_NEVER ifdefs to the MPI branches in
the hybrid code path.

Bugfixes, put swapped some variables between hybrid/hybdat datatype, moved files from xc-pot to hybrid

Now fleur.F90 calls a subroutine that does most of the hybrid stuff.
In eigen.F90 only the non-local potential is added to the Hamiltonian

Removed most of CPP_INVERSION

Introduced module types_rcmat with a general type for real/complex matrices
Introduced general IO for these matrices