[sugar] Salut (link-local) protocol changing - don't expect interop between versions

[Simon McVittie]

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Just a heads-up for anyone who isn't already aware:

We're replacing the Salut (link-local collaborative backend) "rMulticast"
protocol with a better version, over the next week or so (bug #4044). This is
an incompatible change; there may in fact be more than one incompatible change
involved, if we have to change the protocol further when it's had
larger-scale testing.

As a result, until further notice, Salut is not expected to be compatible
between different versions. Please do not report bugs in link-local
(serverless) collaboration unless all participants in the activity are
running exactly the same snapshot of Salut (e.g. the same XO image).

We'll freeze the network protocol again between now and the 1.0 freeze. The
improved rMulticast protocol either fixes, or will enable us to fix, #3294,
#3969, #3465, #3338 and possibly #4127; we might also take the
opportunity to improve the mDNS part of the protocol.

Checking the version on an OLPC: rpm -q telepathy-salut

Checking the version in jhbuild: ls -d source/telepathy-salut-*, see which
one has the latest date in the directory name

Regards,
	Simon
	on behalf of the OLPC Telepathy team
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