plschr: Set character size 

DESCRIPTION:

    This sets up the size of all subsequent characters drawn.  The actual
    height of a character is the product of the default character size and
    a scaling factor. 

SYNOPSIS:

plschr(def, scale)

ARGUMENTS:

    def (PLFLT, input) :    The default height of a character in
    millimeters, should be set to zero if the default height is to
    remain unchanged. 

    scale (PLFLT, input) :    Scale factor to be applied to default to get
    actual character height.