Reorganize splits: move Remove360 scenes/class_03 to test, drop synthetic negatives from test; update card (part 3)

Reorganize splits: move Remove360 scenes/class_03 to test, drop synthetic negatives from test; update card (part 2)

Add crop-shift negatives (759 pairs total); reorganize scenes; update card

Reorganize: backyard split into 3 scenes, test split by collection, test_backyard held out