lisp/outline.el: Add namespace prefixes.

lisp/outline.el: Add namespace prefixes.

* outline.el (outline-hide-entry): Rename from `hide-entry'.
(outline-show-entry): rename from `show-entry'
(outline-hide-body): Rename from `hide-body'.
(outline-hide-region-body): Rename from `hide-region-body'.
(outline-show-all): Rename from `show-all'.
(outline-hide-subtree): Rename from `hide-subtree'.
(outline-hide-leaves): Rename from `hide-leaves'.
(outline-show-subtree): Rename from `show-subtree'.
(outline-hide-sublevels): Rename from `hide-sublevels'.
(outline-hide-other): Rename from `hide-other'.
(outline-show-children): Rename from `show-children'.
(outline-show-branches): Rename from `show-branches'.