Tough feet/doc

• Leg Tentacles, Padded Feet, Hooves, and Roots (not Toe Roots or Rooter) all provide the same effect, so there's no benefit to having this trait in conjunction with them.
• Toe Talons, Gastropod Foot, Huge, Freakishly Huge, Toe Roots, Rooter, and Rabbit Feet do not provide the same benefit; one can benefit from taking them in conjunction with Tough Feet.