Installing the latest IC2 experimental alongside AbyssalCraft causes an unsolvable potion id conflict. Both mods do not allow configuration of potion ID's in their respective config files.

Solution--- add an option to tweak the potion ID.

An easier fix would be if the IC2 devs didn't hardcode the potion ID, and instead simply made sure that the potion was registered with a ID that isn't occupied. But I'll reimplement the potion ID configuration, and add an option to use the dynamic ID configuration whenever it's possible to use that without some mod hardcoding the potion IDs.