Mark Abraham authored Jul 26, 2021 and Artem Zhmurov committed Aug 05, 2021

Grompp loops over molecule types, looking up force parameters for each
interaction from the associated bond types for the system (e.g. from
the force field). The atom types for that interaction have to be
looked up from the atoms for the molecule type that contains it, but
this should be done only once, before considering each bond type as a
possible match. The lookups for both A- and B-state parameters are now
lifted out of the loops over bond types, simplifying the logic and
significantly improving performance.

Once that is done, one custom function could be replaced by
std::equal.

Improved some variable naming

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