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.

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.

Array enpara%evac0 was not allocated. None of the enpara arrays were deallocated.

This is now included in the eig-file, hence
two new routines in eig66_io have been created.

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.

Wrong dimension of array kvec.