[REF] "trim" layout renamed more-intuitive "header_middle_footer_containers", indicating the separate content containers for the page header, middle and footer, to support FiveAlive's full-screen-wide background images, etc.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@48941 b456876b-0849-0410-b77d-98878d47e9d5