This reverts commit 9dd2577.

into DLPOLY input files. In this commit I set the structural basis
for this changes (placed new files at parmed/dlpoly which were
adapted from parmed/gromacs), and I have an initial version of
the dlpolyconfig.py file that is already giving the expected
results. I still need to address the generation of the FIELD file
and other details

can get the velocities from the Amber inpcrd file, in case it is there.

…d.py file