Sub-category image deletion works. Replacement of said image still pending. Everything else seems OK. I should also try to make image addition more "AJAXy" (no page reload after modal close.

git-svn-id: https://plugins.svn.wordpress.org/orderstorm-wordpress-e-commerce/branches/0.6.3@835212 b8457f37-d9ea-0310-8a92-e5e31aec5664