Hi, i have a simple question about installing slony that i didn't see 
in the docs.

If i have two postmasters running on the same machine, one running 
8.0beta1 and one running 7.4.5, do i need to install slony twice, once 
with the --with-pgsourcetree=7.4.5 and once with 
--with-pgsourcetree=8.0.  If so, do i have to use different --prefix 
for each slony installation?

i sent a message a day or so ago about  using slony to help upgrade 
between releases with as little downtime as possible.   I understand 
it's basically the same as setting up a master->slave and then failing 
over, but i wonder if we should have a seperate howto for using slony 
to upgrade?   For example the question i ask here would probably be a 
common scenario that isn't mentioned in howto_install and while 
howto_basic talks about replicating between two databases on the same 
host, it doesn't talk about replicating between two databases on the 
same host under different postmasters.  That might be as simple as 
adding MASTERPORT and SLAVEPORT to the current documentation and 
appropriate commands.

I'm happy to add my experiences to the documentation, but i don't know 
how it would be most appreciated.

--brian

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