[Wocky] access to see a new user's presence

[Ken Raeburn]

> You may be correct that adding a contact before they first log into
> jabber.mit.edu results in the initial request being black-holed.

Seems like a bug.  At least, depending on the model we want to  
present.  Some better options: Give an error on the request to add a  
contact that doesn't exist (yet), if we're assuming that someone with  
a Kerberos identity may never create their Jabber account.  Or  
consider the Jabber account "created" automatically once the user has  
a Kerberos id (or allow any string named as a contact, or any string  
that corresponds to a Kerberos id), and remember the authorization  
request, even if the user has never signed on so far.

I checked on Friday with another contact whose presence I hadn't been  
allowed to see, and that also turns out to be a case of adding a  
contact before the first sign-on.

> Pidgin has a "re-request authorization" right-click menu option on
> contacts.  I don't know if Adium has one as well.

I don't see it, but I can fire up pidgin and play with it.  It also  
seems to show whether authorization requests are pending, unlike  
Adium; I assume rejections wouldn't show up as pending, so re- 
requesting authorization only from those contacts where it's pending  
looks like the right answer.

Ken