Datconv

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Fixes
^^^^^^^^^^^^
- Fixed exceptions being logged only to console (stderr, not by configured logger).
- Fixed duplicated log entries to console (bug introduded by 0.3.0 version).

Improvements
^^^^^^^^^^^^
- Added method ``Datconv().Version()``.

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Fixes
^^^^^^^^^^^^
- Fixed value returned to shell by ``datconv`` script.

Improvements
^^^^^^^^^^^^
- Port to Python 3.
- Add option to inherit logger (to use when datconv is called from Python script that already has its own logger).
- Created basic test scripts - available as separate ``datconv_tests`` package.
- New filter: ``datconv.filters.statex``.

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Fixes
^^^^^^^^^^^^
- Fixed bug that caused writers/dcxml.py to write multiply XML closing tags in case
when the same writer class instance was used to process multiply files.

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Fixes
^^^^^^^^^^^^
- Fixed exception when user press ``Ctrl-C`` before script finish.

Improvements
^^^^^^^^^^^^
- Added command line option: ``--version``.

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Fixes
^^^^^^^^^^^^
- Fixed ``conf_template.yaml`` files.

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Fixes
^^^^^^^^^^^^
- Installation script no longer require ``PyYAML`` to be installed.
- Corrected import statements in ``_skeleton.py`` files.