Liquid simulation not sped up under timestream

[drhead]

Under timestream --units, liquids do not flow at a proportionally higher rate. Effectively this results in fluids behaving as more viscous as timestream has an increasing impact. May be unsolvable, especially if water already is as "low viscosity" as the game can handle, but should be documented.

It also seems as if pumps move liquid units faster despite this, more testing is needed though. Liquid evaporation should also be examined.