[ENH]Allow showing tracker item comments below the tracker item, like in other tracker-software, instead of always enclosed in a tab. This closes my own wish from more than 3 years ago (!). http://dev.tiki.org/item2976

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@48659 b456876b-0849-0410-b77d-98878d47e9d5