Pyramid-describe

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* Restructured doctree to include global "main" section

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* Added support for implicit target references
* Added unicode character support for PDF generation

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* Added "rst2rst.py" script
* Added substitution support (for rST writer)
* Improved separation token serialization (for rST writer)
* Corrected reStructuredText section title rendering
* Corrected DocTree structure (switch "container" to "section" node)
* Removed non-matching extensions from manifest

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* Added suppression of lone-section collapsing into document
* Added support for `format.rst.filters` option
* Small improvement to rST output writer (text escaping)
* Added support for inline email addresses in rST writer

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* First tagged release