Pgtap is creative common and standardize licences

[cvvergara]

Fixes #3031

Changes proposed in this pull request:

• Files standardized on the licenses text
• Script that injects the standard on modified files (Maybe later to be used on a CI)
• Modified the test_license accordingly

Interesting: on the rst files this is how it looks on github

@pgRouting/admins

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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