Merge branch 'ng/texinfo-work' into ng/master

* ng/texinfo-work: (29 commits)
  [ng] texi: drop support for '.txi' and '.texinfo' suffixes
  [ng] coverage: texinfo silent rules with a subdir texinfo file
  [ng] tests: rename silent8.sh -> silent-texi.sh
  [ng] texi: remove some crufty code to support obsolete environment
  [ng] texi: move more code from automake to Makefile
  [ng] texi: "de-prettify" makeinfo command line
  [ng] automake: merge handle_texinfo_source() -> handle_texinfo_helper()
  [ng] texi: simplify handle_texinfo_source by assuming '.info' suffix ...
  [ng] texi: move some more knowledge from automake to texi-spec.am
  [ng] texi: in texi-spec.am, assume suffix for info files is always '.info'
  [ng] automake: remove two unused variables from '&handle_texinfo_source'
  [ng] coverage: texinfo input files using @include directives
  [ng] texi: always look for mdate-sh in the build-aux directory ...
  [ng] refactor: more proper name for a subroutine in automake
  [ng] texi: drop a useless transform when processing texinfos.am
  [ng] texi: adjust names of vars used for silent rules support
  [ng] texi: drop transforms when reading texibuild.am
  [ng] texi: reorganize '.am' fragments even more
  [ng] texi: reorganize '.am' fragments a bit
  [ng] texi: reduce code duplication in output Makefile
  [ng] texi: refactoring in texibuild.am
  [ng] texi: reduce code duplication in texibuild.am
  [ng] texi: read 'texibuild' rules more verbatim
  [ng] texi: be sure to only emit generic pattern rules once
  [ng] texi: drop support for suffix-less info files
  [ng] texi: more target-specific variables use in '.info' build rules
  [ng] texi: reimplement '.info' build using target-specific variables
  [ng] texi: tweak rules for HTML generation to spawn only one shell
  [ng] texi: simplify by always assuming generic rules

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --cc NG-NEWS
Simple merge

diff --cc automake.in
Simple merge