[ENH] New side-column styling, following gezza's suggestion.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52045 b456876b-0849-0410-b77d-98878d47e9d5
[FIX][ENH] Make search icon in-line with input field. Replace icon image with Glyphicon (fixes appearance of inconsistent styles on admin pages, etc.) 

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52046 b456876b-0849-0410-b77d-98878d47e9d5