- patch #1600346 submitted by Tomer Filiba

- Renamed nb_nonzero slots to nb_bool
- Renamed __nonzero__ methods to __bool__
- update core, lib, docs, and tests to match

Objects/boolobject.c

@@ -112,7 +112,7 @@ static PyNumberMethods bool_as_number = {
 	0,			/* nb_negative */
 	0,			/* nb_positive */
 	0,			/* nb_absolute */
-	0,			/* nb_nonzero */
+	0,			/* nb_bool */
 	0,			/* nb_invert */
 	0,			/* nb_lshift */
 	0,			/* nb_rshift */