Get number of electrons from FCIDUMP before checking CAS.
Get number of electrons from FCIDUMP before checking CAS.

This allows the user to not supply the number of electrons
in the FCIDUMP file when using a CAS.

hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,ruthfranklin/hande