Merge branch 'master' into test-protocols

Merge branch 'master' into test-protocols

* master:
  maintcheck: fix maintainer-check failures, both real and spurious
  docs: how to use '-I' option in AM_CPPFLAGS for best VPATH support
  tests: relax a test on amhello examples to cater to Solaris tar
  test defs: function 'is_newest' now works also with directories
  docs: add references between the 2 sections on java support
  Sync auxiliary files from upstream.
  fix typo in recent ChangeLog entry
  docs, tests: synchronize examples on silent-rules from config.site
  tests: fix weakness in 'tests-environment-backcompat.test'
  tests: portability fixes in tests on amhello examples
  remake: add test ensuring that slower remakes don't hang
  remake: fix outdated comment in configure.am
  docs, tests: synchronize examples from docs to tests
  coverage: new test on parallel-tests TESTS runtime overriding
  cosmetics: fix typos in recent ChangeLog entries