[FIX] requireConfirm: Display the busy spinner (tikiModal) on objects that requireConfirm while the service is running, e.g. clearing tracker items or removing fields

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52075 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] trackers: Add a time limit pref for clearing tracker so it should "complete in one go" - should address wish5344 Geoff?

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52077 b456876b-0849-0410-b77d-98878d47e9d5