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Also in this commit: Set the default vacuum energy parameter
to -0.25 Htr. It was -0.1 Htr at some places. The default value
is now stored in constants.f.

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

Note that there are still bugs.

The correction implies a notification to the user.

for centered lattices in atom_sym.f. If generators were given, atomid()
was wrong - corrected also in atom_sym.f. Some formatting of output
improved in atom_input.f, inpgen.f90, symproperties.f, and set_inp.f90.
Calculation of bbmat fixed in setab.f.

The enpara file with integer energy parameters is now generated
iff inpgen is invoked with the command line flag "-genEnpara"

With this commit the file FleurInputSchema.xsd is created whenever
a new inp.xml file is generated. Note that the recipe for changing
the Schema file is found as a comment in io/xml/dropInputSchema.c.

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.

Some preparations for the coming xml input file + bugfix for wrong determination of number of core states

This commit fixes a bug that lead to a wrong number of core states in the inp file. Since this
bugfix was already available in another fleur version that includes the coming xml input. Some
preparations for this input are also introduced at this point.

This is a fix to make inpgen compileable with stringent compiler
options, i.e., "-check uninit -check pointers"

Based on v0.26 hybrid branch