Tt-eggdeps

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Organisation:
- updated namespace package

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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.

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Features:
- Added an option --version-specs (-s) for printing complex version
specifications in a requirements list. They take into account the
intersection of all version requirements for a particular distribution,
but disregard extras completely for the time being.

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Features:
- added an option --once (-1) for printing each distribution only once in
plain text output

- added an option --terse (-t) for suppressing hints at subtrees that are
not printed in order to avoid duplication in plain text output

- added an option --requirements (-r) for printing a list of requirement
specifications from the dependency graph

Organisation:
- added tests for output modules

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Bug fixes:
- In dot output, quote distribution names instead of escaping some
characters. Escaping only '.' was not sufficient - thanks to
Phillip J. Eby for the bug report.