[oe] Change ANGSTROM_EXTRA_INSTALL to IMAGE_EXTRA_INSTALL

[Philip Balister]

I'd like to change the variable used for the user to add packages to a 
standard image from ANGSTROM_EXTRA_INSTALL to IMAGE_EXTRA_INSTALL. This 
is an image property, and not Angstrom specific.

Is there anything wrong with this idea?

Philip

PS: I'd also like to add this to minimal image, objections?
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