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Started some redesign of hsmt in spherical part. Generated new subroutine to calculate the overlap matrix

Note: The planned usage of XML Schema any elements is not possible
as it makes 'the content model nondeterministic'. Therefore this
schema is stricter than planned. It is also incomplete at the
moment, e.g., orbital magnetic moments and forces are not yet
covered.

Also in this commit some smaller layout changed in out.xml.

Available special k points provided in inp.xml are used iff the file
band_inp is not present.

Also in this commit: Some mor copyright notices.