[Vortex] PATCH: Send messages in 1kbyte frames

[Jens Alfke]

Here's the patch I've been talking about: it modifies  
vortex_sequencer.c to break outgoing messages into 1kbyte frames  
("less than 2/3 of the TCP MTU size" as recommended in the RFC.)

* This improves throughput, especially over high-latency connections,  
by allowing the remote peer to send back a SEQ frame before the window  
fills up, so the sequencer doesn't stall.
* It should also make the connection's flow control fairer to all  
channels, by preventing a channel with large messages from using up  
most of the bandwidth (a problem that could otherwise get worse if the  
window size is increased.)

This patch includes the workaround I mentioned earlier today, i.e. it  
leaves channel 0 alone to avoid breaking up the greetings messages.  
The standard Vortex regression tests pass, and my application is  
working reliably (with better throughput than before.)

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?Jens
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