Merge branch 'maint'

Merge branch 'maint'

* maint:
  tests: reorganize tests on backslash issues
  style: add trailing ':' to some test cases
  tests: tweak tests on obsolete EXTRA_DATA variable
  tests: more significant names for some tests
  cosmetics: remove few occurrences of trailing whitespace
  docs: re-introduce mention of two-args AM_INIT_AUTOMAKE invocation
  texi: warn against '.txi' and '.texinfo' input suffixes
  cleanup: remove two lines of dead code in automake
  texi: warn against suffix-less info files
  build: respect silent rules in generation of "amhello" example tarball