[ENH] work in progress - adding new action and related tpl to select trackers to allow initialization of creating new tracker items from a single button. Updating insert_item.tpl accordingly. Also updating application layout tpl with the big blue create button to ease access to content creation.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@50465 b456876b-0849-0410-b77d-98878d47e9d5