TODO for texinfo Debian package
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* make GNU install-info able to write entries with full path into the
  dir file. This way one could reference other info files

* use libpaper/papersize to set /etc/texmf/tex/whatever/texinfo.cnf to
  include @afourpaper in case that papersize=a4. Needs some checking
  like a grep for % ___USE_PAPERSIZE___ in it...

* fix the man page for makeinfo to include --document-language

* fix the @documentlanguage callback function in makeinfo to change
  the interface_language variable.

* go through the bugs on bugs.debian.org and check wether they are
  still present or fixed already (by upstream).