* Turns out that on SunOS/OmniOS the ncurses port does not ship with
  a ncursesw pkg-config file, but the ncurses file is for a version,
  that does contain widechar support as well.
* Instead of adding yet another recursive PKG_CHECK_MODULES() call,
  we now use the AX_WITH_CURSES() macro, which is probably more robust.
  This should at least fix ./configure on OmniOS.
* It also adds a number of feature C macros, that could be useful to
  check in the future.
* At the moment, we strive to support all X/Open-compatible Curses
  libraries, but both enhanced and color functions are required.
  Therefore plain SVr4 Curses is not supported.
* source: https://www.gnu.org/software/autoconf-archive/ax_with_curses.html

* They are used at runtime only by the GTK port.
* Their existence can cause problems if OS-specific build systems
  have to clean these files from the staging directory afterwards.
  This was the case on FreeBSD where the committer refused to remove
  these files after installation.
  In the official FreeBSD port, we therefore currently ship the
  PNG icons unnecessarily.
* They are now installed and shipped only on GTK builds.

* This appears to be the only remaining working web frontend to alt.lang.teco.
* There is https://www.usenetarchives.com/threads.php?id=alt.lang.teco
  which has an archive of very old posts, which is cool, but they appear to have
  stopped synchronizing somewhere around 2022.
* https://alt.lang.teco.narkive.com/ is broken and also not fully synchronized.
* Google Groups stopped working in February 2024.
* The FreeBSD port isn't yet in any quartely branch, so it's unlikely somebody can
  just pkg install it (yet).

* this works by embedding the SciTECO parser and driving it always (exclusively)
  in parse-only mode.
* A new teco_state_t::style determines the Scintilla style for any character
  accepted in the given state.
* Therefore, the SciTECO lexer is always 100% exact and corresponds to the current
  SciTECO grammer - it does not have to be maintained separately.
  There are a few exceptions and tweaks, though.
* The contents of curly-brace escapes (`@^Uq{...}`) are rendered as ordinary
  code using a separate parser instance.
  This can be disabled with the lexer.sciteco.macrodef property.
  Unfortunately, SciTECO does not currently allow setting lexer properties (FIXME).
* Labels and comments are currently styled the same.
  This could change in the future once we introduce real comments.
* Lexers are usually implemented in C++, but I did not want to draw in C++.
  Especially not since we'd have to include parser.h and other SciTECO headers,
  that really do not want to keep C++-compatible.
  Instead, the lexer is implemented "in the container".
  @ES/SCI_SETILEXER/sciteco/ is internally translated to SCI_SETILEXER(NULL)
  and we get Scintilla notifications when styling the view becomes necessary.
  This is then centrally forwarded to the teco_lexer_style() which
  uses the ordinary teco_view_ssm() API for styling.
* Once the command line becomes a Scintilla view even on Curses,
  we can enabled syntax highlighting of the command line macro.

* This pushes to the gh-pages branch since we don't yet want to introduce a new
  workflow (that would have to rebuild SciTECO).
* Built as part of the nightly MacOS builds.
  The Ubuntu builds directly build Debian packages which do not contain the
  HTML manuals.
* I don't want to check in images into the master branch.
  The gh-pages branch is cleaned with every build.
  Therefore I still cross-link to Sourceforge for any additional images
  and documents.
* We could automatically build the cheat-sheet.pdf (TODO?).
  For the time being, we are still linking to Sourceforge.