0.8.4 out, lots of SIP updates

I have 0.8.4 out today.  The question of registration failure I resolved 
by looking at how the invite worked.  Basically, in Aymeric's invite 
stuff, in exosip1, you build an invite, and then send it.  If you get a 
proxy auth failure, you add the credentials and then use the invite 
resend function.

Thinking his registration stuff might work the same way, I now send the 
initial (or refresh) without adding credentials.  When I get a failure 
indicating auth required, I use the credential add, and then resend the 
registration.  This seems to work cleaner for authenticating proxies. 
Was this really how it is intended to work? I am not sure...but the 
behavior is consistent with invite this way.

I do handle various busy/no service states, and signal them into the 
seize state handler as busy/invalid/no answer.  There may be some status 
codes I have missed, as I only added the ones I found in my testing 
(404, 484, 507, etc...).

I added some extended registry definitions, particularly for peering. 
This is the ability of a remote proxy to invite arbitrarly uri's from 
us.  These are sent now to the script registered with the proxy, with 
the %session.dialed containing the target userid, and the new 
%session.auth mode indicated as "peer".  When the proxy registered uri 
is called rather than an arbitrary one, the %session.auth mode is 
"user".  One can reject inbound arbitrary uri's from a proxy you have 
registered with by setting type="user" in the register.sip command.

Similarly, "assign ipaddr[:port]" allows an unauthenticated and 
unregestered proxy to send arbitrary uri's which are sent to the assign 
script.   "assign uri" allow any sip source to invite that specific uri 
from us and get the specified script to run.  This latter use shows up 
as %session.auth "anon".  This basically exposes a script under a public 
uri through Bayonne for anonymous (unauthenticated) direct invites.

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