Pglast

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- Fix spacing before the $ character

- Handle type modifiers

- New option ``--plpgsql`` on the command line tool, just for fun

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- Add enums subpackages to the documentation with references to their related headers

- New ``compact_lists_margin`` option to produce a more compact representation when possible
(see `issue 1`__)

__ https://github.com/lelit/pglast/issues/1

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- Fix sdist including the Sphinx documentation

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- New option ``--parse-tree`` on the command line tool to show just the parse tree

- Sphinx documentation, available online

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- Handle some more cases when a name must be double-quoted

- Complete the serialization of the WindowDef node, handling its frame options

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- Expose the actual PostgreSQL version the underlying libpg_query libray is built on thru a new
``get_postgresql_version()`` function

- New option `safety_belt` for the ``prettify()`` function, to protect the innocents

- Handle serialization of ``CoalesceExpr`` and ``MinMaxExpr``