Bug#402994: use new libpaper hook to track system paper size

[Stephen Gildea <stepheng+debian-bts@gildea.com>]

>     As we found out, libpaper support didn't work in the old
>   setup, anyway.  So we are not dropping any functionality if we just add
>   the hook and the file in /etc/default, setting the variable to "no
>   action".  We are just adding the possibility to have it done with
>   libpaper.  Why would that warrant a debconf question?  Or am I missing
>   something? 

That would indeed be not dropping any functionality, but neither would
it be fixing this bug.  If the default is "no action", then we still have
the same problem we have now where tetex isn't configured with the system
paper size.

Tetex should work out of the box; it should not be necessary for a
sysadmin to know to change a /etc/default file.  Asking a debconf
question, "do you want tetex's paper size managed by libpaper", at
least alerts sysadmins to the possible problem, and at best allows a
"yes" answer to be pre-seeded.

Thank you for all the thoughtful attention you are giving to solving
this issue.

 < Stephen