Notesdir

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- Additions
- Add ``cli_path_output_rewriter`` configuration option for altering CLI output.
- Changes
- When modifying Markdown files, always terminate the metadata block with ``---`` instead of ``...``.
- When modifying Markdown files, always put exactly one blank line between metadata block and body.
- Bugfixes
- Handle an additional (invalid) PDF date format I've encountered in the wild.
- Fix a problem with printing changed file paths in ``backfill`` command.

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- Bugfixes
- For Markdown files, if the document contained additional ``...`` or ``---`` lines after the YAML metadata, the whole document up to that point was incorrectly being treated as part of the metadata.
- Do not require ``add_tags`` and ``del_tags`` arguments in ``Notesdir.change``.

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- Additions
- Add ``skip_parse`` configuration option for indicating files that should not be parsed or edited, but should be affected by ``organize``.
- Changes
- Ignore links and hashtags in fenced code blocks in Markdown.

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- Additions
- Add :code:`notesdir backfill` for setting title and creation date in bulk.
- Changes
- Do not rewrite absolute paths unless the target file is also being moved.
- Bugfixes
- Do not rewrite intra-document links like "``foo``" to "``.foo``".
- Include time zone (UTC) on datetimes loaded from filesystem metadata.

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- Initial release.