The protocol file is not documented and people have to read code to
understand the specification.
This can lead to unexpected or not optimal results so it's better
to have it documented.
The m4/spice_manual.m4 came from spice server and is meant to be
reused.
Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
Acked-by: Victor Toso <victortoso@redhat.com>
