[sugar] Implicit saving

[Bert Freudenberg]

The implicit saving on activity close gets in the way of how etoys  
traditionally worked. If I create, say, a simulation, I will arrange  
everything and then save that project, so when I later open it for  
demonstration, it is in a state ready to be started. But when I then  
run the simulation and quit, it will not be in the ready-to-run state  
anymore.

Any idea how that problem should be tackled in Sugar?

- Bert -