[Pharo-project] snapshot methods

[Camillo Bruni]

I am always confused about the snapshot behavior. 
Yes, it returns true when we are in the new image, but this is far from obvious 
:/.

How about a more explicit method for snapshotting and continue with different 
code
in the new / old image:


self stuffInCurrentImage.

Smalltalk 
        snapshotIfNew: [ self stuffInNewImage ] 
        IfCurrent: [ self stuffInCurrentImage ]

self stuffInCurrentAndNewImage.