Loaded waiting robots look better

Their recorded width interfered with their animation of waiting.
Robots can reference sub-paths on a nest

E.g. something in a hole in a box on a nest.
Removed redundant code

add_animation_class resets the width and height.
Fixed bugs in training robots with nests

Robots can be trained to either remove top of nest stack or something
contained in top widget.
Boxes no longer lose close button

Or resize handles.
Removed commented out code.