Store diagonal HEFF in JobMix
The effective Hamiltonian was stored only in the JobIph file. If the HEFF
keyword of RASSI was tried with the JobMix file, it gave zero energies. Now store a diagonal HEFF in JobMix too, such that HEFF
and EJOB give the same result.
Also some small doc fixes.
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Documentation updated or not needed. -
Test created or not needed. -
Attribution in source files and CONTRIBUTORS.md
updated if necessary.