BUG FIX: correct spatial slot and spin channel are calculated for UHF integrals.
BUG FIX: correct spatial slot and spin channel are calculated for UHF integrals.

Note that *all* previous UHF calculations are suspect (though amazingly this
was not triggered by the current tests).

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