New upstream version 0.2.3

docs/source/contents.rst

docs/source/data_file_validation.rst

docs/source/demo.rst

docs/source/demo.txt

docs/source/graphics/base_class_hierarchy.dot

docs/source/graphics/base_class_hierarchy.png

docs/source/hierarchy.rst

docs/source/index.rst

docs/source/install.rst

docs/source/license.rst

docs/source/nxdl_file_validation.rst

docs/source/overview.rst

docs/source/source_code/cache_manager.rst

docs/source/source_code/finding.rst

docs/source/source_code/github_handler.rst

docs/source/source_code/h5tree.rst

docs/source/source_code/ignore/analyze.rst-ignore

docs/source/source_code/ignore/cache.rst-ignore

docs/source/source_code/ignore/nxdl_rules.rst-ignore

docs/source/source_code/ignore/nxdlstructure.rst-ignore