fix item positioning when invalid category ids are found

git-svn-id: svn://svn.code.sf.net/p/magmi/code/trunk@996 8a1fb3a6-a994-4f0a-9076-b49fc636424d
handle exclusion modification for existing images

git-svn-id: svn://svn.code.sf.net/p/magmi/code/trunk@997 8a1fb3a6-a994-4f0a-9076-b49fc636424d
removed prototype.js from build

git-svn-id: svn://svn.code.sf.net/p/magmi/code/trunk@998 8a1fb3a6-a994-4f0a-9076-b49fc636424d
request to fix "overlinked" configurable attributes

git-svn-id: svn://svn.code.sf.net/p/magmi/code/trunk@999 8a1fb3a6-a994-4f0a-9076-b49fc636424d