Realistic Fluids Overhaul compatibility and rainfall fork

5.2: Hotfix for a concurrent modification error

5.3: Removed diagonal water flow (still renders diagonally)

5.4: Fixed inaccurate warnings on mod fluids

NB: There is a config option for height of rain; I suggest leaving it at 0 or 1 unless you don't mind water floating in the air.

NB: Bodies of water will overfill in rain; I have not been able to track down why. You may consider the slight beach flooding to be a good thing.