June 26, 2013 by Michael Wetter:
Corrected wrong type for FRWat_min, FRWat_max
and liqGasRat_max.
They were declared as Modelica.Units.SI.MassFraction,
which is incorrect as, for example, FRWat_max can be larger than one.
May 16, 2008 by Michael Wetter:
First implementation.