document edit panel: allow to pass custom configurations for the edit panel

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2719 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
asset import from server: use progressbar and splitted jobs to avoid server timeouts

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2720 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
create variant from tree

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2721 1f8fe7d8-47f0-464c-8d0a-336f4953ab05