  plfont(font)
  ************

  plfont

  Sets the default character font for subsequent character drawing. Also
  affects symbols produced by plpoin.This routine has no effect unless the
  extended character set is loaded (see plfontld).

  font (PLINT, input): Specifies the font:

   o 1: Normal font (simplest and fastest)
   o 2: Roman font
   o 3: Italic font
   o 4: Script font

