Due to conflict with important Emacs packages like ESS, another option for
setting the outline-map prefix described in the comment-section (M-#), and two
new bindings for `outorg-edit-as-org' added that combine very well with this
prefix ('#' and 'M-#').
outline-minor-mode-prefix changed to 'M-#', although it does not really take
effect when set in outshine.el, must be set in init file.