From: Simon McVittie <simon.mcvittie@collabora.co.uk>
Date: Thu, 10 Oct 2013 19:25:34 +0100
Subject: [PATCH 4/7] Turn Connection.FUTURE into Conn.I.Sidecars1
If something has been implemented without changes for 4 years, but
has not been declared core functionality in that time, then it's
clearly an optional interface.
This is a simple rename: no content changes other than the name and
the <tp:added>. Connection.FUTURE was also identical to the version
in Gabble and Salut, apart from the <tp:added>.