Automatic hardcore dist. estimates in Fiksel() and DiggleGratton().

   dg.R
   DiggleGratton.Rd
   fiksel.R
   Fiksel.Rd
      The hard core distance parameters in these models
      can now be omitted, and will be estimated by the
      minimum nearest neighbour distance * n/(n+1)
      in the selfstart function.

   listof.R
	buglet fix

   NEWS
   DESCRIPTION
      updated.