Added bindo.cpp, which contains simplification of variadic bind from bindv.cpp. Output from bindo.cpp is: (_1,_2)(1,2) functor_any(:1:2) (2,_1)(1) functor_any(:2:1) (2,_1)(2) functor_any(:2:2) (2,1)() functor_any(:2:1) (2,1)(1) functor_any(:2:1) (2,1)(1,2) functor_any(:2:1)