[Xesam] Metadata Storage Daemon

[Jamie McCracken]

> >
> > with a dumb metadata daemon you lose it (all the metadata still points
> > to the old file) unless something keeps it in check (which as i said
> > means changing vfs, email apps etc to do this)
> 
> That is handled by another service. I don't think it is up to the indexer or 
> the store to watch files (well, maybe the indexer to update data, ok, sure). 
> And in the end even in your combined solution you have two components 
> internally. So for the sake of decoupling and cleaner APIs we should define 
> it as different services from the beginning.

the user defined metadata store will be a separate dbus interface

whether its a separate process is an implementation detail

jamie