Flooding energy increase in kT/ps

The actual flooding energy used during the simulation is (``Initial energy for flooding in kT'') $+({\rm elapsed~time})*$(``Flooding energy increase in kT/ps'') as long as this expression is smaller than the ``Final energy for flooding in kT''. Otherwise, the flooding energy is set to ``Final energy for flooding in kT''. This allows (1) to have constant flooding energy (increase 0), (2) linear increase with time and (3) linear increase with time followed by a constant maximal value of the flooding energy.