Calculation of weights and exponentiated potential broken

[SuperFluffy]

Commit 3835fea and prior changed the way the Hamiltonian terms are constructed and how the exponentiated are handled. Especially the construction of the potential term saw big changes: in the future, only changes in the auxiliary fields themselves are to be tracked, while the possible values the exponentials of the decoupled potential terms can take are calculated ab initio and stored in memory as arrays. These arrays will then be indexed by a given configuration of the auxiliary fields to calculate the full statistical weight of that configuration.

To Do: Calculate Green's functions and transition probabilities from the potential values indexed by the current auxiliary field.