Collection of minor changes. Mostly related to graphics, fonts etc.

  morishita.R -> morisita.R
      Corrected spelling (in filename, graphics, output, etc)

   plot.fv.R
   plot.fv.Rd
      New argument 'mathfont'.
      Mathematical expressions are now set in italic font, by default.

   util.R
   spatstat-internal.Rd
      New internal function 'fontify'

   addvar.R
   progress.R
      Fixed mathematical labels (to cope with new code).

   util.R
      Improved 'fontify'

   addvar.R
   progress.R
      Tweaked labels again

   plot.fv.R
      Bug fix - parameter 'lwd' was not passed over to legend()
      	      - and 'legendargs' was not passed to legend

   DESCRIPTION
   NEWS
	updated.
Deleted previously renamed file morishita.R.