PEP 9999: Recording the source URL of an installed distribution

[sbidoul]

This Draft PEP proposal is a prerequisite to implement pypa/pip#609, and has been created following a discussion on discuss.python.org/c/packaging.

It is supported by a proof a concept implementation in pip: pypa/pip@master...sbidoul:pip609-sbi

It is largely inspired by the Source URL concept in PEP426.

[the-knights-who-say-ni]

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[brettcannon]

This PEP has no sponsor and has not gone through a round of discussion on distutils-sig yet, so I'm closing the PR until it's closer to being ready for inclusion in the PEP index.