[Groff] Patches to clean papersize selection.

[Fabrizio Polacco]

Hi,
as I have two old requests to get groff recognize the "global" paper
selection in Debian systems (/etc/papersize); I studied the matter and I
propose the following changes:

in grolj4/lj4.cc:

  handle_unknown_desc_command():
  * add a new "unknown" command to DESC, named "paperfile", whose arg is
    the name of the file containing the name to be looked in the table.


in grops/ps.cc:

  * created a static global var (not the best way to share values
    between classes :-)
  * added the same new "unknown" command "paperfile". Here we don't have
    a table of fonts, so I used the same algorithm found in
    devps/Makefile .
  * added the check in ps_printer constructor, to see if the paper size
    was loaded from the new command.

This way, I can substitute the line 

        papersize a4

in the DESC of lj4 and ps font (which is actually added by the Makefile)
with 

        paperfile /etc/papersize

to get it from the configuration file, without the need of setting the
-p option (which is not so trivial when you, as example, issue command
"man" :-)

This last change is not in the patch, as it could be considered "debian
specific" :-)

I have tested it working good in lj4, but I did not get any difference
for postscript. I hope I haven't missed something, as I know little if
not none about postscript.

The patch makes use of the strcasecmp change I sent in a previous
message.

A better approach would be to use Yves Arrouye's libpaper.

Cheers,
fab
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