Renamed annex.security.allowed-http-addresses to
annex.security.allowed-ip-addresses because it is not really specific to
the http protocol, also limiting eg, git-annex's use of ftp and via
youtube-dl, several other protocols.
The old name for the config will still work.
If both old and new name are set, the new name will win.
The feeds for playlists seem pretty broken, since they have the oldest
items first and are truncated, so after a few dozen items, new items
never appear on them. Channel feeds don't currently have this breakage
(although perhaps Google will find a way to break them eventually..)
