This is a standalone help system. It takes care of launching the Eclipse with
its help system implementation, and controling it. This class can be
instantiated and used in a Java program, or can be launched from command line
to execute single help action.
Usage as a Java component:
create an instantance of this class and then hold onto this instance for
the duration of your application
call start()
call displayHelp(...) or displayContext(..) any number of times
