#2 Database contains redundant information

[Peter Newman]

The `atom types` and `forces` tables contain significant redundant data.

Due to the branching nature of the submitted simulations, branches contain mostly the same parameters as the parent simulation. These could be linked by index to another table, without duplicates.

forces - c6, c12, rA, krA, rB, krB
atom types - name, ratio, radius, volume, surface tension, atom number, mass, massB, q, qB