deb: update to standards version 3.9.4
deb: add a watch file with comments on why a watch file won't work
deb: add DEP-3 headers to all patches
deb: drop build-depends on texi2html, unnecessary and supserseded
deb: set debhelper compat to 9
deb: add lintian override for unused zeromq autotools that are out-dated