Code clean-up. Removed 'unused' variables spotted by codetools.

   DESCRIPTION
   NEWS
	nickname changed to 'Do The Maths'

   NEWS
	updated.

   addvar.R
   alltypes.R
   cdftest.R
   centroid.R
   clarkevans.R
   clip.psp.R
   colourtables.R
   crossdistlpp.R
   diagnoseppm.R
   distan3D.R
   dummy.R
   envelope.R
   envelope3.R
   envelopelpp.R
   evalcovar.R
   eval.fasp.R
   exactMPLEstrauss.R
   Fest.R
   Gest.R
   hypersub.R
   ippm.R
   Jest.R
   Kest.R
   Kinhom.R
   Kmulti.R
   Kmulti.inhom.R
   kppm.R
   Kscaled.R
   Ksector.R
   lineardisc.R
   linearK.R
   linearKmulti.R
   linearpcf.R
   linearpcfmulti.R
   linfun.R
   linim.R
   lppm.R
   markcorr.R
   measures.R
   morphology.R
   mpl.R
   nearestsegment.R
   nnclean.R
   nncorr.R
   nndistlpp.R
   pairdistlpp.R
   pairorient.R
   parres.R
   pcf.R
   pcfinhom.R
   pcfmulti.R
   pcfmulti.inhom.R
   persp.im.R
   plot.fv.R
   plot.im.R
   plot.ppm.R
   plot.ppp.R
   pointsonlines.R
   ppm.R
   ppmclass.R
   predict.ppm.R
   quadrattest.R
   rhohat.R
   smooth.ppp.R
   summary.ppm.R
   symbolmap.R
   texture.R
   util.R
   window.R
   wingeom.R
   xypolygon.R
     Removed variables which are identified as 'unused' by codetools

   methods.linfun.Rd
     Consequential changes

   options.R
   spatstat.options.Rd
      New option 'eroded.intensity', defaults to FALSE

   Gcom.R
   Gcom.Rd
      Responds to spatstat.options('eroded.intensity')