* todos.el (todos-add-item-if-new-category): Change default value.

* todos.el (todos-add-item-if-new-category): Change default value.
(todos-show, todos-jump-to-category, todos-add-file)
(todos-add-category): Update doc string to reflect new default
prompt for item insertion.
(todos-add-file): Add omitted argument to called-interactively-p.
(todos-show): Improve handling of adding first category.