Pip-run

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* semver deviation *

41: Removed support for ``__dependency_links__``
in scripts. Instead, use PEP 508 syntax.

For example, to run a script requiring requests at master::

__requires__ = ['requests git+https://github.com/requests/requests']

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39: Removed ``pip_run.deps.on_sys_path``, originally intended
for API-use for making packages available at run time in
the same process.

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36: Instead of soliciting the environment variable,
the workaround for pip 4106 is now automatically
applied, but only when it is needed.

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36: Allow bypass of workaround for pip 4106
by setting ``PIP_RUN_NO_PATCH_PREFIX``.

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* Updated documentation.

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34: Renamed project from ``rwt`` to ``pip-run``.