Fixed EES problem by making ancillary equation builder use pFluid->enthalpy_Trho instead of IProps.  Why does this make a difference?  No idea.  Added test executable in EES to test DLL.  EES now calls a DLL instead of all being compiled together.  Better? Nope.  Ugh.  EES is not nice.

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>