[sugar] PresenceService API improvements (was Re: Trial 3 goals)

[Simon McVittie]

On Fri, 10 Aug 2007 at 20:46:01 +0100, Morgan Collett wrote:
> * We'll have an API change for PS when the invitations stuff lands, as
> instead of Share we'll have Invite and Advertise, to make the
> distinction clear.

We also need Unadvertise() (suggestions for better verbs welcome).
Alternatively, we could replace Advertise() with
SetAdvertised(advertised: bool).

	Simon