Tl.eggdeps

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- Nothing changed yet.

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- Port to Python 3.7 and 3.8 while dropping support for Python 2.

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- No changes, just repeating the release due to a mistake.

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Organisation:
- Move project to git at <https://github.com/tlotze/tl.eggdeps>.

- Some clean-up.

- No longer include package root data files as that doesn't work well with
pip installations.

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Features:
- Handle more detailed information about what extras of other distributions
are being depended upon by each distribution in the graph.

Bug fixes:
- Work with distribution names that occur with inconsistent capitalisation.

Organisation:
- Several code clean-ups, added documentation (thanks to Marius Gedminas).

- Use sphinx to build documentation.

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Features:
- Added an API for including a comment in a generated dot file, use it to
record the arguments eggdeps was called with. Thanks to Christian
Zagrodnick for the suggestion.

Bug fixes:
- Omission of a subtree in the plaintext output would cause all following
siblings of the mount point to be skipped.

- The plaintext graph built from the whole working set would be incomplete
if any graph roots were cyclic. One distribution from each such cycle will
be considered a root now. This also affects colors in dot graphs.