Move code from an external project to directory external

The code was copied at some time from an external project into the lx directory. Since it fails the license header check the code was moved to the externals directory. Also a second copy of the headers were deleted.

added CI/CD label

added 2 commits

• 72d8d4db - 1 commit from branch computing:master
• 1fa009af - Move code from an external project to directory external

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added 1 commit

• a5172cb5 - Improve license header test script

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requested review from @e.clerkin

Dear @f.uhlig, @v.friese, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

resolved all threads

added 3 commits

• c48708b5 - 1 commit from branch computing:master
• 5b679426 - Move code from an external project to directory external
• cf8a6ed3 - Improve license header test script

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added 3 commits

• 52caa620 - 1 commit from branch computing:master
• 1f30cd30 - Move code from an external project to directory external
• ec5392e9 - Improve license header test script

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enabled an automatic merge when the pipeline for ec5392e9 succeeds

merged