[sugar] Tubes message dropping

[J.M. Maurer]

> We could modify our IBB implementation to fragment big stanzas but that
> would make the code sensibly more complicated. Furthermore I'm not sure
> the server will allow us to send N MAX_SIZE stanzas consecutively. IBB
> is really not designed to send big datas (XEP suggests 4096 bytes as max
> payload size).
> A quick workaround could be to raise the allowed stanza max size in the
> server config.

Could we try this for now as a workaround? I think this is the sole
cause of people 'bugging' me with "my documents are getting out of sync"
reports. I'd like to make sure that it really is though :)

Marc