reverted  manual unique full path check (asset, document, object)

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2854 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
reverted  manual unique full path check (asset, document, object) + removed from update script

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2855 1f8fe7d8-47f0-464c-8d0a-336f4953ab05