[x] The three separate Gromacs tools for NVT, NPT and production simulation can be merged. Would need a minor update to the training material as well (and the test workflow we created).
[x] Allow analysis tools to accept other formats that DCD/PDB, if easy to fix, which it should be for MDAnalysis tools at least.
[ ] Make better tests, replacing sim_size with assert_contents if possible.
Things to fix: