[fix][multidomain][couplingdata] fix upwind enthalpy of components.

Katharina Heckrequested to merge
fix/stokesdarcy-upwind-enthalpy into master

Positive diffusive fluxes mean that the inside enthalpy should be used as it is an outflux

fixes #670 (closed)

  • implement component enthalpy in miscible fluidsystems as they could be used for the coupling
Edited by Katharina Heck

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