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RASSI: Fix bug with combining MS and SS files

Jellby requested to merge bugfix into master

Combining files (JobMix or h5) of *MS-CASPT2 and SS-CASPT2 in a single RASSI produced bogus results because the effective Hamiltonians were not properly merged. This should fix it at least in some cases.

Also added a StAverage = n keyword to RASSCF, equivalent (and incompatible with) CIRoot = n n 1. I was tired of explaining how CIRoot works to students who only need the simpler form.

  • Documentation updated or not needed.
  • Test created or not needed.
  • Attribution in source files and CONTRIBUTORS.md updated if necessary.

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