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It can be deactivated by using the command line switch -no_cdn_hdf

- Relaxation of atom positions now works as it should.
- The code also becomes clearer.

- Relaxation of atom positions should work now, but it is not yet beautiful.
   -> An unnecessary additional step function is store in cdn.hdf in this case.

This is surely still buggy. ...not as buggy as the last commit.
...There is light at the end of the tunnel.

...still very buggy.

There are still bugs. Probably many bugs.

Also: Replaced the -dd command line switch bei -delden. This
is done because there also is the -sd command line switch and
densities should not be deleted by accident.

The feature is used by invoking fleur with -hdf_cdn -dd a-b
to delete all densities with index between a and b. Using
-dd a only deletes density a.

Note: The required space for the densities will not yet be given
back to the system. The size of the file stays the same. A
solution to this problem may be the usage of the tool h5repack.
It should be available everywhere.

- The time stamp is written when the wirst density entry for a given
  density index is written.

- Also in this commit: write this time stamp out in if the info mode
                       is used.

Note: At the moment the distance in the info mode is off by one iteration.

Also in this commit: Added version info to cdn.hdf and pot.hdf

...this is very incomplete at the moment.

...and get rid of wkf2 file in this case.