For this cdn_mt/abcof.F90 and cdn_mt/abclocdn.F90 had to be adapted
to feature the needed functionality. toPulay is still available in
the code but never called.

...to allow compilation on older Intel compilers.

Cleanup and bugfixes are required.

a) Second spin for force a8 was wrong
b) LO contribution to force_a21 was wrong

The OMP parallelization yielded wrong results for the vtl array with the ifort 18 compiler.

...it was an error before.

This is done by replacing the parallelizationParameters XML element by a more
sophisticated parallelSetup section in out.xml

Replace broyden2 by broyden agein until the problem with continuous restart are understood and solved

Added diagonalization switch that does not do any diagonalization but simple outputs the matrix for debugging...

The continuous restartability still does not seem to work correctly.

The problem was due to several variables not being declared as private in
an OpenMP loop. The bug was introduced in commit b065f991.
Sorry for that! ;)

This implies the reduction of required metric calls in the broyden code path
from 4 to 2. This is now equivalent to the number of metric calls in the
old broyden code path.

This is not yet fully functional and not yet activated in the code. To activate it
the broyden call in "mix" has to be replaced by a broyden2 call.

Update .gitlab-ci.yml, Removed PGI-compiler as it currently can not compile FLEUR and I do not want to get an email about this every night 

The OpenMP SIMD instructions made problems on ifort 12 and ifort 15. We
have to introduce a filter to exclude these compilers from respective
code sections.

The instructions were introduced in commit 97ef6a4d.