Log Message:
Update to 2.001, noticed via repology. From the changelog:

Enhancements
------------

- Level 0 headings
- New command line options
- Table enhancements
- HTMLDOC support
- Improved LaTeX support
- HTML formatting enhancements
- HTML meta information and stylesheet support
- Stylesheet-friendly HTML generation
- Embedded documentation enhancements
- Miscellaneous stuff

Fixes
-----

Indented tables now work as expected, i.e. leading whitespace at the
beginning of the heading row is now accepted and remaining rows have
that amount of whitespace trimmed.

When generating txt output, leading cell whitespace now works as
expected. Previously, multiple spaces were converted to a single
space.

Attribute values containing ;; no longer have the whitespace around
the character sequence trimmed.

Internally, unhandled internal directives no longer produce a warning.
(As a result, it's now easier to extend things without "breaking"
existing drivers.)

When generating HTML, the HTML_PRE_SECTION is no longer prepended
unless a table of contents is generated.

Incompatibilities
-----------------

When HTML is generated, the default footer no longer contains a line.
To get the old behaviour, set the HTML_OLD_FOOTERS variable, e.g.

       sdf -2html -DHTML_OLD_FOOTERS ...

The HTML driver no longer uses special embedded comments to work out
where to put the table of contents.

The getcli macro no longer searches the include path: it just executes
the command.