Minor bugfixes.

   fv.R
     Bug fix in [.fv
     in handling the 'alim' attribute.

   fv.R
   plot.fv.R
   envelope.R
   mincontrast.R
     The 'alim' attribute of an fv object can now be NULL.

   util.R
     intersect.ranges now handles NULL intervals.

   tests/fvproblems.R
     Added test of bug.

   lohboot.R
   lohboot.Rd
     Now handles the case where fun is a function.

   markcorr.R
     Bug fix in markcorrint: ignored 'r'
     Thanks to Shaaban Ghalandarayeshi.

   DESCRIPTION
   NEWS
   spatstat-package.Rd
     Acknowledged Shaaban Ghalandarayeshi.

   DESCRIPTION
   NEWS
      updated