Unify mkguga
Unify the mkguga codes. Currently similar codes found in rasscf, mcpdft, rassi, mlcr, and the caspt2 folders. Furthermore, remove as much a possible code that is essentially the same in the rasscf and mcpdft folders. Convert the guga codes to F90 and implicit none.
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Documentation updated or not needed. -
Test created or not needed. -
Attribution in source files and CONTRIBUTORS.md
updated if necessary.