Potassium parameters are added

git-svn-id: https://svn.ices.utexas.edu/repos/clsb/trunk/moil@4788 90e2fc84-bd37-0410-82f1-ae2f889bfac2
fixing the mass of K


git-svn-id: https://svn.ices.utexas.edu/repos/clsb/trunk/moil@4789 90e2fc84-bd37-0410-82f1-ae2f889bfac2