add enthalpy, internal energy, heat capacity and vapor pressure for constant component

Merged Katharina Heck requested to merge feature/add-vaporpressure-constant-component into master
  • check if this changes any tests: I could not find a test with constant component and non-isothermal
  • check for consistency with other components: i will adapt simpleh2o accordingly. the napl components still calculate the gas enthalpy as liquid enthalpy + vaporization enthalpy but I am going to leave this as it is.
  • add test

fixes #1015 (closed)

Edited by Katharina Heck

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