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This reverts commit 5ef91d22.

This should fix CI build errors in parent repository.

The old _is_gro_coord function inexplicably used split() even though
gro files fixed field (nb: the parsing was still done correctly).  Now
it uses fixed field substrings.

I have made things more technically correct: GROMACS processes pairs
and exclusions separately.  Also added proper support for fudgeLJ term.
Also added improved gro file parsing (technically it’s a fixed-field
format but this works too).

Swigged python docstrings now include documented return values and type
information or their arguments. They are generated in numpydoc format.
Furthermore, all of the Python app layer docstrings have been changed
to numpydoc format. The filterPythonFiles.py script which helps to
generate the Doxygen Python API docs has been updated to reflect these
changes.