new gromacs version (5.0) and increased release no to 6
this time actually increase release no to 6 and fix syntax error in apbs Makefile
fixed a few problems with lammps
Merge pull request #2 in APS/chemistry-roll from release/APS-11-add-new-gromacs-version-5.x-to-chemistry to master

* commit '4153225aecbd9b9d152303efb1966776c0f80ff6':
  fixed a few problems with lammps
  this time actually increase release no to 6 and fix syntax error in apbs Makefile
  new gromacs version (5.0) and increased release no to 6