/* Deletes variable V from dictionary D and frees V.
This is a very bad idea if there might be any pointers to V
/* Deletes variable V from dictionary D and frees V.
This is a very bad idea if there might be any pointers to V
dictionary should be deleted when any transformations are
active on the dictionary's dataset, because those
transformations might reference the deleted variable. The
dictionary should be deleted when any transformations are
active on the dictionary's dataset, because those
transformations might reference the deleted variable. The