This object along with xcmPrtInterpPCLPitchDenominator sets
the default for the PCL-specific PJL variable 'PITCH.
These two object sets the default pitch size for the PCL default
font defined in xcmPrtInterpreterPCLFontNumberDflt.
This variable only applies when the default font specified is
a scalable fixed pitch font.
A value of zero shall mean not specified.