Prevent images from being regenerated again under a new alias #458
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Make names_created in PGcore.pm a property of the PGcore object rather than a package variable. Since the new method is called and initializes this property to the empty hash on each successive run, this prevents carry over of old values. That carry over caused unnecessary regeneration of images under new aliases.
Note, that I have removed the gifs_created property of the PGcore object that was completely unused.