* [DH_EDGE_WEIGHT,FIX] Typo in documentation.
* [DH_NAVIGATE,SC] Removed unused predicate dh_current_location/2.
* [DH_RANDOM_LOD_WALK,NEW] Added graph variant of DH random LOD walk predicate.
* [DH_STEP,NEW] Added graph variant of DH step.
* [DH_TEST,SC] Use graph for random navigation strategy.