Fix code and doc involving marked items.
* todo-mode.texi (Marked Items): Correct omission of item deletion from commands applying to both todo and done items. * calendar/todo-mode.el: Fix handling of marked items and make minor code improvements. (todo-edit-item): If there are marked items, ensure user can only invoke editing commands that work with marked items. (todo-edit-item--text): When there are marked items, make it a noop if invoked with point not on an item; otherwise, ensure it applies only to item at point. (todo-item-undone): If there are marked not-done items, return point to its original position before signaling user error. (todo--user-error-if-marked-done-item): New function. (todo-edit-item--header, todo-edit-item--diary-inclusion) (todo-item-done): Use it.
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