Really fix double-escaping issue and protect task/note content.
* planner-publish.el (planner-publish-markup-task): Remove bad patch.
Protect the task description from closing tags.
(planner-publish-markup-note): Protect the note content from closing
tags.
(planner-publish-task-tag): Remove bad patch. Remove read-only
properties from task description so that it gets interpreted by Muse.
(planner-publish-note-tag): Remove read-only properties.
git-archimport-id: mwolson@gnu.org--2006-planner-el/planner-el--devel--0--patch-63