Add Atomic Partitioning Weight Modifications

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Add the following weight partition schemes:

1. Becke (w/ and w/o atomic size adjustments https://doi.org/10.1063/1.454033
2. Strattman-Scuseria-Frisch https://doi.org/10.1016/0009-2614(96)00600-8
3. Laqua-Kussmann-Ochsenfeld https://doi.org/10.1063/1.5049435
4. Delley https://doi.org/10.1063/1.458452 Delley partitioning #60
5. Franchini-Philipsen-Visscher https://doi.org/10.1002/jcc.23323 Franchini et al atomic partitioning #69