Incompressible CoolProp tests do not compile

[bilderbuchi]

On the OM test suite, the tests Test.CoolProp.Incompressible.IncompressibleCoolPropMedium and Test.CoolProp.Incompressible.IncompressibleCoolPropMixture does not compile with

[/home/hudson/saved_omc/libraries/.openmodelica/libraries/ExternalMedia 4.0.0/Media/IncompressibleCoolPropMedium.mo:49:5-49:76:writable] Error: Variable R not found in scope BaseProperties.

Because IncompressibleCoolPropMedium extends from Modelica.Media.Interfaces.PartialMedium (and not from ExternalMedia.BaseClasses.ExternalTwoPhaseMedium), I'm pretty sure

ExternalMedia/Modelica/ExternalMedia/Media/IncompressibleCoolPropMedium.mo

Line 49 in 8f5df11

R = Modelica.Constants.small "Gas constant (of mixture if applicable)";

should be R_s, not R. Possibly this was overlooked in the MSL 3->4 transition?
I dont know if this needs further fixes elsewhere.

[carowjp]

If line 49 is corrected to R_s then the next error is:

Translation Error [ExternalMedia.Media.IncompressibleCoolPropMedium: 60:7-60:44]: Type mismatch for positional argument 3 in ExternalMedia.Test.CoolProp.Incompressible.IncompressibleCoolPropMixture.Fluid.density_pTX(X=varProps.Xi). The argument has type: Real[1] / expected type: Real[2]

ExternalMedia/Modelica/ExternalMedia/Media/IncompressibleCoolPropMedium.mo

Line 60 in 8f5df11

d = density_pTX(p, T, Xi, phaseInput);

[ibeyers]

Exchanging X[xN] for X[:] in every mass fraction input resolved this for me.

so in every function of ExternalMedia.Media.IncompressibleCoolPropMedium I changed the line to:
input MassFraction X[:] "Mass fractions";

[bilderbuchi]

That is weird though, as that test has substanceNames={"LiBr|calc_transport=1|debug=1000","dummyToMakeBasePropertiesWork"}, so that has size 2, so Modelica.Media.Interfaces.PartialMedium.nS should be 2, so the nX beside that should also be 2, but seems to be 1 for some reason?

@casella do you know what could be going on here?