add GROMACS minimal version check

[boegel]

A test using the hEGFRDimerSmallerPL GROMACS input fails if the GROMACS version is too old:

Program:     gmx mdrun, version 2019.3
Source file: src/gromacs/fileio/tpxio.cpp (line 2695)
MPI rank:    0 (out of 96)

Fatal error:
reading tpx file (benchmark.tpr) version 119 with version 116 program

[smoors]

if we can convince Victor to provide the non-binary input sources, we can create the .tpr file as part of the test with the gromacs tool grompp, then will always have the correct version.

[boegel]

Input files come from https://www.hecbiosim.ac.uk/access-hpc/benchmarks, so I think only .tpr files are available?

@victorusu: is that correct?