What this MR does / why does DuMux need it:
Fixes some errors related to the SimpleCO2 component.
We should add a test that uses the nonisothermal aspects of this component. The
BrineCO2 fluidsystem is not well suited for it, as it uses
liquidX functions in strange places. As that fluidsystem was created for supercritical conditions it's not really a good fit for the
SimpleCO2 component anyway.
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\n character. Make sure there is no
\ No newline at end of file comment in "Changes" of this MR.