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Up to now this is only a partial solution. There is still reading
of the n_mmp_mat file in the SCF loop to read in the optional mixing
parameters.

...also in this commit: global/constants.f -> global/constants.f90

I couldn't identify the original bug so I did some major changes and
now everything is different.

There still is a problem but it is different now.

Note: This seems to break the LDA+U part. I commit it at this point
to get it on a computer with Valgrind available.

...this is done to make gfortran with debug options happy.

...hope, it works.

-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.

Note: There is still some additional work required in fleur.F and maybe also
in other files.

In this commit there mainly are some adaptions to the new eigenvector I/O.

...and also completely re-layouted that file.

@Daniel: You will probably hate me for this. Sorry! ;)

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

This commit is the first of probably several similar commits that adds
missing initializations found by valgrind.

Special thanks for this commit go to Aristid Breitkreuz and Christoph Dittmann
who pushed me to trying out valgrind.