texinfo-6.7.91 pretest

[Gavin Smith]

The next pretest for the next Texinfo release has been uploaded to

https://alpha.gnu.org/gnu/texinfo/texinfo-6.7.91.tar.xz

We hope to release this fairly soon barring the discovery of any major issues.

Summary of changes since previous pretest (6.7.90, 2021-02-23):
* some fixes of indentation in TeX output for @multitable and @image
* some memory leaks fixed in info program
* various improvements to the JavaScript browsing interface, thanks to
Per Bothner
* compilation fixed on DragonFlyBSD
* other build fixes on various platforms (AIX 7.1, NetBSD, MS-Windows)

The most significant changes since the last release (September 2019)
are to the HTML output of the texi2any conversion program. Support for
MathJax is added for formatting of mathematical expressions. A
JavaScript-enhanced browsing interface is provided on an experimental
basis. The default output for HTML uses section names in preference to
node names, and simple lists of sub-sections replace Info-style menus.
There should be a significant speed-up due to more of the program
being written in C rather than Perl.

Pretest releases are made to give a chance for a new release to be
more widely tested, including on a variety of platforms.

Please send any comments to <bug-texinfo@gnu.org>.

Support free software ~ https://www.fsf.org/ ~ https://www.gnu.org/

Full news:
* Language:
  . @example takes an argument to specify the language
  . mark these commands as deprecated, not to be used:
    @centerchap, @definfoenclose, @refill, @inforef.
  . completely remove @setcontentsaftertitlepage and
    @setshortcontentsaftertitlepage
  . new paper size @bsixpaper

* texi2any
  . should be faster as Perl XS parser is enabled by default
  . remove 'SHOW_MENU' customization variable.  add 'FORMAT_MENU'
    customization variable.  'FORMAT_MENU' set to 'menu' is the same
    as 'SHOW_MENU' set to 1 and 'FORMAT_MENU' set to 'nomenu' is the
    same as 'SHOW_MENU' set to 0.
  . only check menu structure if CHECK_NORMAL_MENU_STRUCTURE variable is set
  . changes to HTML output
    . MathJax support for display of math.  new variables HTML_MATH,
      MATHJAX_SCRIPT and MATHJAX_SOURCE.
    . new variables JS_WEBLABELS and JS_WEBLABELS_FILE to support
      JavaScript License Web Labels
    . by default, use sectional tables of contents instead of menus
    . use section names in links by default (configure with
      xrefautomaticsectiontitle customization variable)
    . CONTENTS_OUTPUT_LOCATION used to configure location of table of contents
    . new variable USE_NODE_DIRECTIONS to use node or section structure
      for node directions
    . copiable anchor links for definitions with COPIABLE_ANCHORS variable
    . experimental JavaScript browsing interface enabled with INFO_JS_DIR
    . don't add an extra period before file extension given as an argument
      to @image if image file is not found

* info
  . support compressed dir files

* texi2dvi
  . stop on first error in input file

* texinfo.tex
  . put logical page numbers into PDF's ('page labels')
  . put chapter numbers in the PDF outline
  . new Finnish translation

* Distribution
  . autoconf 2.71, automake 1.16.3, gettext 0.21