* todos.el: Move auto-mode-alist entries above provide sexp.

* todos.el: Move auto-mode-alist entries above provide sexp.
Update adapted diary-goto-entry, so it also works with todo items
when the buffer in which the included todo file is processed for
the Fancy Diary is not killed.
(todos-insert-item-from-calendar): Move to item editing commands
section of file.  Add doc string, use todos-basic-insert-item and
remove mistaken invocation of todos-show.