Change slater_condon0_mol to have correct interface.
Change slater_condon0_mol to have correct interface.

As we use a function pointer, sc0_ptr, to point to the relevant
slater_condon0_* function, slater_condon0_mol must have the same
interface as other slater_condon_* functions.

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