- Update to 13.1
  * In math environments 'gather', 'gather*', 'gathered', 'multline'
    and 'multline*', fill commands such as 'M-q' and 'C-c C-q C-e' are
    disabled.  This sorts out the inconsistency between those and
    'equation', 'displaymath' environments, in latter of which filling
    is already disabled.
    If you want filling in such environments, customize
    'LaTeX-indent-environment-list' to remove them.
    Auto fill continues to work in such environment anyway.
    In addition, AUCTeX adds support of alignment at '&' sign in
    'align'-like environments such as 'alignat', 'aligned' and so on,
    as well as 'matrix'-like environments such as 'pmatrix', 'bmatrix'
    and so on.
  * Now two commands 'Texindex' and 'Texi2dvi' are available when you
    type 'C-c C-c' in Texinfo mode.  The command 'Texindex' runs
    'texindex' on index files and 'Texi2dvi' runs 'pdftexi2dvi' or
    'texi2dvi' according to the value of 'TeX-PDF-mode'.
    So you can typeset Texinfo documents into PDF or DVI format from
    within AUCTeX.
  * AUCTeX's own help messages for LaTeX errors are now shown only for
    LaTeX runs.  AUCTeX shows raw error/warning messages found in
    '.log' files for runs of formats other than LaTeX, such as plain
    TeX, ConTeXt and Texinfo, as it does even for LaTeX runs when it
    can't find a matching entry in its own help message catalogue.
    Due to this change, customize option 'TeX-error-description-list'
    can no longer have a fallback entry that matches any error.  If
    your customized value includes such entry, typically '(".*" . "No
    help available")', please remove it.
  * Two functions 'TeX-split-string' and 'TeX-assoc' are now obsolete
    and will be removed in future release.  If your personal code uses

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