pg_dump 'die on errors' option

Dear patchers,

Please find attached a submission to add a "die on errors" option to
pg_restore, as it seems that some people have scripts that rely on the
previous "abort on error" default behavior when restoring data with a
direct connection.

It works for me. Maybe Philip could test that it works for him?

Have a nice day,

--
Fabien Coelho - coelho@cri.ensmp.fr