Maintainance mailing list; dump standards version
Add two build targets; don't ignore clean failures (keep lintian happy)

Two things picked up by lintian - one was a couple of missing targets,
and the other was that the clean target ignored make clean failures;
instead only run make clean if the Makefile exists.

Signed-off-by: Matthew Vernon <matthew@debian.org>
Changelog for 1.0-1
Merge branch 'branch-1.0'

Incorporates Debian packaging fixes from
Matthew Vernon <matthew@debian.org>.
Release 1.1