Copyright for onnx source package in Oracular

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Source: https://github.com/onnx/onnx
Files-Excluded: stubs/*
Comment:
 .
 Some files such as onnx/onnx-operators.proto contains a banner indicating that
 they are auto-generated files, and their souces are templates such as
 onnx/onnx-operators.in.proto that can be found under the same directory.

Files: *
Copyright: Facebook, Inc.
           Microsoft Corporation.
           ONNX Project Contributors.
License: Expat
Comment:
 - stubs/* were removed because they are arguably copyrightable
 - *.onnx file is a new serialization format defined by this software.
   These files can be read and parsed by this software, see
   docs/PythonAPIOverview.md for detail about the way to read/write/modify.
 - *.pb files in the test directories are serialized binary google protobuf
   files, which ship some simple matrices that can be read and converted to
   numpy array, see docs/PythonAPIOverview.md for detail about reading,
   writing, and modification.
 - The data matrices in *.pb files are unrelated to pre-trained neural
   networks and ML-Policy. They are simple matrices intended to test
   mathematical operations.
 - The "year missing from copyright" issue has been reported to upstream:
   https://github.com/onnx/onnx/issues/2533

Files: tools/protoc-gen-mypy.py
Copyright: Copyright (c) 2017 Dropbox, Inc.
License: Apache-2.0
Comment: https://github.com/dropbox/mypy-protobuf/blob/master/LICENSE

Files: onnx/tools/net_drawer.py
Copyright: (c) 2016-present, Facebook Inc.
License: Apache-2.0
Comment: https://github.com/caffe2/caffe2/blob/master/caffe2/python/net_drawer.py

Files: onnx/common/array_ref.h
Copyright: LLVM Project
           Facebook, Inc.
           Microsoft Corporation.
           ONNX Project Contributors
License: U-OF-I-BSD-LIKE

Files: onnx/backend/test/case/node/scatter.py
 onnx/backend/test/case/node/scatterelements.py
 onnx/backend/test/case/node/gatherelements.py
Copyright: Facebook, Inc.
           Microsoft Corporation.
           ONNX Project Contributors.
           2017 Sia Rezaei
License: Expat
Comment: contains snippet from https://stackoverflow.com/a/46204790/11767360
 The rest parts of the code is written by onnx contributors
 Snippet Copyright: 2017 Sia Rezaei (stackoverflow)
 Snippet License: CC-BY-SA-4.0

Files: onnx/backend/test/case/node/resize.py
Copyright: Facebook, Inc.
           Microsoft Corporation.
           ONNX Project Contributors.
License: Expat
Comment: contains snippet from https://stackoverflow.com/a/1235363
 The rest parts of the code is written by onnx contributors
 Snippet Copyright: 2009 pv. (stackoverflow)
 Snippet License: CC-BY-SA-4.0

Files: debian/*
Copyright: 2019-2020 Mo Zhou 
License: Expat

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