Dflit

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- A new ``flit init`` command to quickly define the essential basic metadata
for a package.
- Support for :doc:`entrypoints`.
- A new ``flit register`` command to register a package without uploading it,
for when you want to claim a name before you're ready to release.
- Added a ``--repository`` option for specifying an alternative PyPI instance.
- Added a ``--debug`` flag to show debug-level log messages.
- Better error messages when the module docstring or ``__version__`` is missing.

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- Users can now specify ``dist-name`` in the config file if they need to use
different names on PyPI and for imports.
- Classifiers are now checked against a locally cached list of valid
classifiers.
- Packages can be locally installed into environments for development.
- Local installation now creates a PEP 376 ``.dist-info`` folder instead of
``.egg-info``.