Avoid 'dpkg-buildflags --export=configure, since it doesn't exist in squeeze.
Two minor build fixes.

- Fix install-dev when _SRCDIR_ is set
- Don't require root to install systemd units
Merge from Jelmer to fix builds on all recent Deb/Ubuntu versions again.
Merge from dx, fixes two build issues.
Merging two other Debian fixes in preparation for a 3.2.2-1 upload.
3.2.2-1. Minor change, removed very old compatibility kludge.
Merge changes from 3.2.2-1 Debian upload.
Remove MSNXMPP specific code

The MSN XMPP gateway was shutdown december 2013 and isn't coming back.
Handle not-authorized stream errors, avoid reconnect

Got this one while trying to connect to google servers with hipchat auth
Add support for XEP-0203: Delayed delivery (message timestamps)

Very similar to XEP-0091 which is already supported, but was marked as
obsolete, replaced by XEP-0203. The main differences are the tag name
and the timestamp format.

Due to the similarities, both XEPs are still supported.
nick_lc: use unsigned chars to avoid unicode issues
Debian bug #764181: Accidentally had an LGPL header in a bunch of files.
Replaced them with GPL headers where possible. OSCAR and Twitter modules
can't be relicenced though, so add an LGPL blurb to debian/copyright.
Bunch of merges from dx.
doc/AUTHORS updated to the current state of things.