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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.

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- changed the setup of the parallelization (mpi/mpimakegroups is obsolete)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 :-)

Not writing out the explicit version of the file could
lead to problems, e.g., dependence on a non-existing
sym.out file.

...still not functional.

Tests added: CuBandXML, CuDOSXML.

CuDOSXML does not yet pass.

Changed behaviour of strho switch. It is now only controlling if FLEUR is stopping after generating a
starting density.

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

Also in this commit: Enabled output of program version to out.xml.

Note that there are still some known issues:

1. Possibly incorrect data for energy parameters, LOs
2. Incomplete data: electron configuration, comment
3. Not neccessarily explicit data: Bravais matrix

This commit also provides helper routines to write out data into out.xml.
Nothing is tested yet. The routines might be horribly wrong.

Note that there are still bugs.

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.

This commit introduces the new chkmt.f90. Besides some exceptions this
new routine should yield the same results as the old one. With a runtime
scaling of O(N_atoms) it overcomes the bad O(N_atoms^4) scaling of the
old pendant.

Based on v0.26 hybrid branch