Use create_spawned_particle_ptr in HFS FCIQMC.
Use create_spawned_particle_ptr in HFS FCIQMC.

This is required for HFS to actually use the initiator approximation.
Tests indicate that <O> is biased with the initiator approximation.
I suspect the case of creating HF psips from H psips needs to be handled
correctly (ie at the same level as the non-diagonal spawning events).

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