* some further cleanups of the help system, added:

* some further cleanups of the help system, added:
	modest_window_mgr_register_help_id, and
	modest_window_mgr_get_help_id
  which will give you the right help_id for the
  current window; windows register the help id in their
  _init. For the main window, we check what the
  selected folder is, and use modest_tny_folder_get_help_id
  to get the help_id from there.

pmo-trunk-r3617