Add support for paper sizes other than 8.5 x 11 inches

Upstreaming a two-decade old local patch from Solaris.

This adds new command line arguments -papertype, -pheight, and -pwidth

Originally implemented by Jay Hobson in August 2002 to fix Sun bug 4704388: xpr does not work with A3 paper

Signed-off-by: Alan Coopersmith alan.coopersmith@oracle.com