Integrate https://github.com/nexB/scancode-toolkit into DRAT as an option

[chrismattmann]

Imported from apache/drat#113: apache/drat#113

Original author: @chrismattmann
Original state: closed
Created: 2018-02-23T16:57:37Z
Updated: 2020-10-04T18:45:48Z
Closed: 2020-10-04T18:45:48Z

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Instead of only using RAT, we can also use https://github.com/nexB/scancode-toolkit.
Simple replacement in the PGE.
This is a Google Summer of Code project for 2018. Comment here if interested.

[chrismattmann]

Imported comments from apache/drat#113: apache/drat#113

Comment by @ThejanW on 2018-02-27T09:08:56Z

Hi @chrismattmann, I'm interested in taking up this project.

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Comment by @chrismattmann on 2018-03-03T06:41:39Z

awesome @ThejanW let's do it!

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