Place tagging widget in a separate action and dialog class; it is
indicated by a 'tag' icon for better clarity.
-- This removes the requirement to specify a dummy 'edit' action on
multi-rules; instead, the separate tag action will appear automatically
as long as 'tags' is specified under the multiEdit's properties.
Conflicts:
client/WEB-INF/classes/resources/messages.properties
ui/css/cloudstack3.css
ui/index.jsp
