add page function "container"
add container page template
better subpages_pager
add link and button for creating subnorms in containers
dont use full width headline in show_container as there is no sidebar
modify edit form for container pages
add ui for creating containers
add javascript for disabeling unused inputs in new page form when container is checked
always enable formatting on container page
enforce page_index_as_tiles on container pages
pep8
Merge pull request #709 from xi/feature-containerpage

container pages