Datconv

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Improvements
^^^^^^^^^^^^
- Added new standard filters: pipe, gen_rec.
- Added optional filter method ``setHeader()`` to inform filter about contents of data header and give it a chance to change it.

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Fixes
^^^^^^^^^^^^
- Small fixes in documentation.

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Improvements
^^^^^^^^^^^^
- XML Reader: added parameter ``foottags``.
- XML Reader: parameter ``rectags`` can be empty (see documentation).
- XML Writer: added parameters ``add_header``, ``add_footer``.
- Added JSON Writer.
- Added JSON Readers.
- Added CSV Reader.
- Added command line option: ``--help``.

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Fixes
^^^^^^^^^^^^
- Small fixes after documentation was published `on-line <http://datconv.readthedocs.io>`_.

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Improvements
^^^^^^^^^^^^
- Adopted pydoc descriptions in sources to Sphinx.
- Created first version of documentation using `Sphinx Project <http://www.sphinx-doc.org>`_.

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Improvements
^^^^^^^^^^^^
- Extended method ``Datconv().Version()`` for possibility to display version of external module.