changes to the hf guess. Basically changing it such that the manual input right now is done with spatial orbitals. one-electron reading is working, but not implemented so far because I still need to put the keywords in the input file, but it will be in the next day or so
changed the manual input of hf_occ. Currently the input file just either reads the manual hf_occ in spatial orbitals or if there is no input, there is a default, which so far just assumes canonical energy ordering.
finished up hf_occ implementation. One needs to always specify hf_occ.
modified keyword m_hf_occ_user from boolean to string