Dotlock

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* Fix handling of relative URLs in JSON API

* Include sources other than PyPI when running `install --skip-lock`

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* Add `install --no-venv` flag to install into system python

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* Fixed installing local dependencies with relative paths.

* Improved warnings on platforms that do not match ``env.json``.

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* Revised README.rst

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* Limit simultaneous connections on download, not just during resolution

* (fixed) Don't require ``package.json`` for commands that don't depend on it

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* (broken) Don't require ``package.json`` for commands that don't depend on it