Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 close_to(Arg1, Arg2)

 close_to(Arg1, Arg2, Arg3)

 relatively_close_to(Arg1, Arg2)

 relatively_close_to(Arg1, Arg2, Arg3)

 run(Arg1)

 perm(Arg1, Arg2)

 perm_map(Arg1, Arg2)