Reduce redundant code in pipe world renderer
Change how pump handles water.
Added config "consumeWater" which defaults to false. If false, pumps will not remove water source blocks if it detects more than 9 blocks of water in the area.

This should significantly reduce chunk rerenders and search cost (search terminates after 9 blocks). Essentially making a water pump nearly as computer friendly as an Aqueous Accumulator.
Merge branch 'master' of https://github.com/BuildCraft/BuildCraft