tags, heads and remotes are all views that inspect a (particular class
of) refs, so allow the user to easily switch between them by adding
the appropriate navigation submenu to each view.
Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com> Acked-by: Jakub Narebski <jnareb@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>