Resolve "Error in gromacs parser pruning thermo data"

Merged Lauri Himanen requested to merge 1060-error-in-gromacs-parser-pruning-thermo-data into develop

Closes #1060 (closed)

@himanel1 : You have to also merge the corresponding parser branch in atomistic. Wasn't sure if I needed to put in a merge request there as well.

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