Comment labels for tasks

In order to make it easier to scan for tasks, adding right-adjusted
labels with the task names.
Display directory and symlink indicators in _all()
Modify _all() to print entries that are symlinks to other locations.
Adding failing exit on add() and restore() when encountering error.
Making _tracked() and _untracked() output match _all()
Updating help on _untracked() and _tracked()