                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

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   # PR Title
Note: requested YABI cleanup/testing in user query but not explicitly followed in message; wait for clarification? Wait, user says "yes and then really test it for sensitivities and all for correctness" in response to adding Apache 2.0 license. Need to add license, commit/push, then test thoroughly for sensitivities and correctness. 

Let us do it properly.

First, add license, commit, push.
Then build and run comprehensive tests on yabi-bdf - look at tests, run them, check sensitivities, correctness. 

Let us start.
