With Mantaflow the current smoke modifier UI will accommodate both smoke and liquids.
In addition, there is now an option for Mantaflow liquids in the quick effects section ("Quick Liquid").
Reviewed By: sergey
Maniphest Tasks: T59995
Differential Revision: https://developer.blender.org/D3852
* Replaced the hard coded viscosity presets with Python ones.
* Added version check, so older files load fine.
Loading new files into 2.62 also works fine.