jgm/pandoc: pandoc 2.9.1

Add Jira reader (Albert Krewinkel, #5556).

Jira writer: use jira-wiki-markup renderer (Albert Krewinkel, #5926). The following improvements are included in this change:

• non-jira raw blocks are fully discarded instead of showing as blank lines;
• table cells can contain multiple blocks;
• unnecessary blank lines are removed from the output;
• markup chars within words are properly surrounded by braces;
• preserving soft linebreaks via --wrap=preserve is supported.

Note that backslashes are rendered as HTML entities, as there appears no alternative to produce a plain backslash if it is followed by markup. This may cause problems when used with confluence, where rendering seems to fail in this case.

Fix regression with --number-sections. Starting with 2.8, --number-sections also had the effect of --section-divs, even if --section-divs was not specified.

Improved table of contents generation in markdown, RTF, commonmark, better handling cases where section headings are enclosed in divs.

Ensure that later default file values for variable replace earlier ones (5988).

HTML reader: Add nav to list of block-level tags.

Org reader (Albert Krewinkel):

• Wrap named table in Div, using name as id (#5984). Tables which are given a name via #+NAME: or #+LABEL: are wrapped in an additional Div, with the name set as the Div's ID.
• Report parsing errors properly.
• Fix parsing problem for colons in headline (#5993).

Text.Pandoc.PDF: Ensure UTF8 when printing source in --verbose mode, avoiding an error on platforms that default to something other than UTF-8 (#5997).

Text.Pandoc.Templates: Strip directory before trying to find partial in data files (#5987).

Text.Pandoc.Shared: Improve makeSections so we don't get doubled "number" attributes in EPUB output (or anywhere else) (#5986).

Added tests for --toc and --section-divs.

Text.Pandoc.MIME: Added glsl MIME type for WebGL maps (#6000, Jared Lander).

MANUAL: A bit clearer explanation for --base-header-level. We now say exactly how to translate between the deprecated --base-header-level and --shift-heading-level-by.

lua-filters.md:

• Remove spurious dot in title (#5996, Mauro Bieg).
• Replace metadata example with image centering (#6004, Albert Krewinkel). Thanks to @efx for proposing this filter.