Take arbitrary args for GROMACS submission script function

[theavey]

The function should be able to take any dict arguments for either the SGE system or GROMACS. This should then be passed to some specific function. The specific keyword arguments should be put into this dict (if they're not already there), and passed to the sub-functions.

This is probably better than just taking a list or string arguments, though those could also be allowed with some type checking.