[Tagging] RFC - More sensible values for fountain=*

[Davidoskky]

> I do not like very much at all the key 
> "new_key_describing_fountain_style" — if that is really a literal key 
> you (Davidoskky) are proposing here. If it is a place-holder for what 
> we eventually decide upon FOR the semantics of that key, then OK, I'm 
> nodding my head and continue to listen / read. 

Of course, this is not the key I'm actually proposing. I just don't want 
to get in another discussion about semantics and thus I would like to 
simply discuss the need of such a key without defining the actual name.

If people agree that such key is required I will then try to find, 
together with you, an appropriate name for such key.