gc_list_move():  Make this truly equivalent to remove+append.  While nothing in gc currently cares, the original coding could screw up if, e.g., you tried to move a node to the list it's already in, and the node was already the last in its list.
gc_list_move():  Make this truly equivalent to remove+append.  While
nothing in gc currently cares, the original coding could screw up if,
e.g., you tried to move a node to the list it's already in, and the node
was already the last in its list.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator