Move foreign potential energy accumulation

Move foreign potential energy accumulation

The potential energy contributions to the foreign lambda
Hamiltonian differences were summed in sum_dhdl() which meant
that the foreign energy differences were not complete when
do_force() returns. Now there are summed in
accumulatePotentialEnergies() which is called instead of sum_epot().

Also consistently changed the lambda vector to ArrayRef in the force
routines and made it const.