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`NBANDSGW` Number of orbitals updated in GW

`NBANDSGW ` = [integer] twice the number of occupied states

The flag `NBANDSGW` determines how many QP energies are
calculated and updated in GW type calculations. This value
usually needs to be increased somewhat for partially or
fully selfconsistent calculations. Very accurate results
are only obtained when `NBANDSGW ` approaches `NBANDS`,
although this dramatically increases the computational requirements.

N.B. Requests for support are to be addressed to: vasp.materialphysik@univie.ac.at