Clean up individual child traversals in transforms using the new visitchild() method.
Clean up individual child traversals in transforms using the new visitchild() method.

da-woods/cython,scoder/cython,cython/cython,da-woods/cython,scoder/cython,cython/cython,cython/cython,da-woods/cython,scoder/cython,scoder/cython,cython/cython,da-woods/cython