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