Added pmax_sat and Tmax_sat functions for for HEOS in order to help with saturation limits for flahses

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Updated macros in CoolProp.cpp for deeper debugging of PropsSI function

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Merge branch 'master' of https://github.com/coolprop/coolprop