implmented aws storage as archetypes field storage
fixed transaction abort during remote source remove.
clean up code for aws image and file fields.
fixed aws image and file properties installation
use default methods in case aws storage is turned off.
update tests
added test for aws storage.
clena up aws widgets
added name prefix for aws files
added filename prefix for aws files
added migration script
added url generator utility for objects and brains.
added metadata update during migration script
fixed bug with image width and height attributes.

Also fixed migration procedure.
set proper width and height attributes during migration
added upgrade step for new version of package
fixed image object url generation
fixed patch, patch news item content type.
made migration script more flexible.
fixed image url generation for scales.