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Note: Also in this commit:

1. Changed test values in NiO_ldauXML test since now the broyden files get deleted
   when a new density matrix is generated
2. The NiO_ldau test should not work any more since linear mixing for the density
   matrix is removed for the old inp file. (It is not specified in the n_mmp_mat
   file any more)

Note: Two changes have been done in global/types.F90:

   1. MERGE(jsp,4,l_noco) -> MERGE(4,jsp,l_noco)
      (I think the new code is correcter. This change is required)

   2. Some dimension variable was replaced by stars%ng2.
      (Maybe this is not required and maybe the previous variable was more correct.)

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