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[material] Add option to PengRobinson::computeMolarVolume

Merged Timo Koch requested to merge feature/molarvolume-pengrobinson into master

  • Ignoring the first two roots of the equation for Z in the smallest one is zero or negative. There was a comment documenting that behavior, but it was not implemented.

  • Throwing NumericalProblem if no positive Z has been found or the number of roots is 2 or more than 3 (no check was in place)

  • Throwing NumericalProblem if the found molar volume turned out to be zero, negative, or NaN. (Replacing assert)

  • Added handleUnphysicalPhase flag (true by default). If false, the single-root case is not checked for critical state of the fluid (otherwise, Michelsen test for a mix of hydrocarbons does not work).