[Optimization] Optimize package tracing by only calling SCALIBR on inventories whose file location is found in the underlying layer of a chain layer (the layer only has files found in the layer, whereas the chain layer has files found in all previous layers).

[Optimization] Optimize package tracing by only calling SCALIBR on inventories whose file location is found in the underlying layer of a chain layer (the layer only has files found in the layer, whereas the chain layer has files found in all previous layers). #88