BISERVER-8010 Made gwt specific implementation for info center help link

BISERVER-8141 Changed modeler dialog title.

BISERVER-8141: Changed title from "Data Source Model" to "Data Source Model Editor".

BISERVER-8010: Added gwt specifif uri handler, modified the entry point to pull in the uri handler, modified the dialog to set the uri handler instance unto the modeler controller, modified xul and properties to perform the help action.
BISERVER-8141: changed the modeler's dialog title.