[jabber.el] [Patch] Support for server-side message archive management (XEP-0313)

[Thibault M. <thi...@gm...>]

Hi all,

I am not sure this is the right place for this, but I have implemented
some support for server-side archive management (XEP-0313 Message
Archive Management) in emacs-jabber.

The attached patch (to apply on top of the master branch) contains the
current version.  Most of the code is in the new jabber-mam.el module,
with additional modifications to the jabber-chat and jabber-history.
The code branches off the file history extraction to create and send the
MAM query instead of reading the archive from a file.  MAM results are
processed by a function added to `jabber-message-chain'.  The code
supports result paging according to XEP-0059 (Result Set Management).

Does this look like something that could be merged?  Any suggestion or
review would be welcome.

Thanks in advance.
thibault

P.S.: Is there any syncing with the github emacs-jabber repository
(https://github.com/legoscia/emacs-jabber?).  I am thinking it may be
easier to get people to test this on github (I could submit a pull
request there if preferred).