fixup! Convert timestamps to milliseconds

I have no idea what I was smoking yesterday.

That'll teach me to push to github without even running the test suite.
fixup! missing dot.
silence unused variable warnings
Also store messages tagged with <allow-permanent-storage/>

http://mail.jabber.org/pipermail/standards/2013-June/027711.html
http://matthewwild.co.uk/uploads/message-processing-hints.html
s/newer/never/g

Radek pushed a commit for this upstream, but it's easier to just sed it
here.