[Groff] new .psbb request

[Werner LEMBERG]

Dear friends,


I've implemented a new .psbb request to get the bbox values of a PS
file.  The bbox coordinates are returned in the new registers llx,
lly, urx, and ury.

.PSPIC has been adapted to use it -- it's no longer necessary to call
groff with the `-U' switch.

I'm a bad C++ programmer, thus I've simply taken the code from psbb.c
(this program has been removed consequently) and inserted it almost
literally into input.cc...

Please test!

CVS users: please update with

  cvs -z9 update -dP

to remove the empty directory.


    Werner