[FIX] tooltips: Correction to r52893 - $.extend seems to do odd things with jQuery DOM array objects, $.merge seems to do what we want here, and add some more filtering on the extra elements being added to avoid duplication - filegal thumbnail popovers now working again

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52896 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] tooltips: Remove css/less override for .popover width that seems no longer to be needed (was required with cluetips so was ported to bootstrap (done manually)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52897 b456876b-0849-0410-b77d-98878d47e9d5