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Also in this commit: improved Htr to eV factor in evaldos and
                     adapted the related tests.

Now the attribute minDistance is read in from the input file into
the variable input%minDistance. By default this variable is 0.0 but
it can be set to finite values in the inp.xml file. It is supposed
to be an additional optional convergence criterion to stop calculations
when they are converged.

The temporary change to POINTER lead to the error:

/usr/users/iff_th1/micha/FLEUR-git-repo/fleur/cdn/cdnval.F90(525): error #6547: The ARRAY argument of the ALLOCATED inquiry intrinsic function shall be an allocatable array.   [Z_R]
             IF (.NOT.ALLOCATED(zMat%z_r)) THEN
-------------------------------------^
/usr/users/iff_th1/micha/FLEUR-git-repo/fleur/cdn/cdnval.F90(540): error #6547: The ARRAY argument of the ALLOCATED inquiry intrinsic function shall be an allocatable array.   [Z_C]
             IF (.NOT.ALLOCATED(zMat%z_c)) THEN
-------------------------------------^
compilation aborted for /usr/users/iff_th1/micha/FLEUR-git-repo/fleur/cdn/cdnval.F90 (code 1)

eig-file/data IO is broken and hence the version is not useful yet.

qpw_to_nmt. This variable should be added to xml-Schema!

removed: weight, natd, nkpts,nkptd

- made l_zref a local variable no longer in type sym
- changed the setup of the parallelization (mpi/mpimakegroups is obsolete)
- added new command line switches yet to be documented :-)

XML-Codepath has to be adjusted

...still not functional.

Tests added: CuBandXML, CuDOSXML.

CuDOSXML does not yet pass.

The problem only occured because stars%gamx is changed after it
is initialized. I therefore introduced an additional variable
gmaxInit in type t_stars.

I use this variable to write out the comment from the
input file to out.xml.

Note that there are still bugs.

For very simple test systems fleur can now use the inp.xml file
as an input. Note, however, that the functionality is still
very incomplete. Therefore, preliminary fleur has to be invoked
with -xmlInput to make use of inp.xml.

Besides the feature incompleteness it is expected that there are
still some bugs in loading inp.xml. So far it is
only tested for Si and Fe. For Fe a small deviation from the
reference total energy is observed (0.03 mHtr), the magnetic
moments are off by 0.003. The cause is yet unknown.

Besides the conventional input, the new inpgen now also generates an
inp.xml file containing all required data to start a calculation. The
commit also includes additional command line parameters for inpgen:

   "-explicit": This writes k-points, symmetry operations, and the Bravais
                matrix explicitly into the inp.xml file.
   "-noXML":    This switches of the generation of the inp.xml file.

Based on v0.26 hybrid branch