Propogating slot changes in Morphs

[Chris Double]

When doing the scrolling changes in my image I added a slot to 
WorldMorph to hold the current point when initiating the scroll. The 
methods in the WorldMorph traits object used this to read/write and do 
scrolling.

This didn't change existing WorldMorphs since they are clones of 
WorldMorph and the data slots are actually held in the morph, not a 
parent slot. So I manually re-added the slot in all existing 
WorldMorph's to prevent errors when the WorldMorph trait methods were 
called.

Is there a way to do this automatically when adding/changing slots in a 
Morph? What's the idiom in Self for dealing with this sort of thing?

Chris.
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