Deletes CO2 interaction parameters from co2_PR_example.yaml, such that
phase construction in PengRobinson_Test.cpp covers the cirtical property
lookup capabilities in PengRobinson::getCoeff. Note that this required
changing some of the regression test expected values, as the critical
properties don't correspond perfectly with the interaction parameters
previously stored in co2_PR_exmple.yaml.
decaluwe
d61bc3bcf2