Merge branch 'minor'

* minor:
  cosmetics: fix typo in a user-facing message in tests
  automake: account for perl hash order randomization
  tests: avoid use of intervals to capitalize letters
  cosmetics: untabify the install-sh script
  install-sh: assume that "set -f" and "set +f" work...
  install-sh: assume ${var:-value} works as expected
  install-sh: assume 'dirname' is available and working correctly
  distcheck: don't allow overriding of --prefix and --srcdir by the user
  tests: expose bug#14991 (relates to 'distcheck')

diff --cc NEWS
Simple merge

diff --cc doc/automake.texi
Simple merge

diff --cc lib/Automake/Variable.pm
Simple merge

diff --cc lib/am/distdir.am
Simple merge

diff --cc t/list-of-tests.mk
Simple merge