[Nepomuk] Activities protocol

[Chani]

> 
> I was doing some thinking on the bus... and I like this scoring idea.
> 


some more random thoughts:

there's a temporal aspect to all this, isn't there? I mean, there are 
resources that were related to my activity in the past - many of which may be 
useful for it again in the future. and then there's resources that are related 
to it in the present, things I'm *actually* using right this moment (or the 
last moment that I was in that activity).

resource associations (and I say resources not files, because #plasma is not a 
file) can be from any period in time (ooh ooh! timeline plasmoid for noting 
things that'll be associated with it in the future!).  kwin, on the other 
hand, only really cares about the present. :)