Adding option to sort by bigger bin first and by bigger item first separately.

[jrhau]

Hello,

I would like to propose to add the functionality to sort by bigger bin first and by bigger item first separately. This enhances the algorithm efficiency when trying to determine the number of bins necessary to pack all items.

See py3dbp_test-example.zip.

By starting to fit the largest item in the smallest box first, I'm able to pack all my items in one large box less!

I also added the Bin.weight and Bin.empty_bin_weight attribute so we get the real total weight.

py3dbp_test

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Best regards,
Jonathan Rhau