[Automake-NG] [FYI] Merge branch 'master' into ng/master

[Stefano Lattarini]

commit e402b325d6d5a58c67a794f9406008ae620a8c1e
Merge: dc33f64 dc4eaab
Author: Stefano Lattarini <address@hidden>
Date:   Tue Apr 30 17:36:41 2013 +0200

    Merge branch 'master' into ng/master

    * master:
      sync: update files from upstream with "make fetch"
      maintcheck: remove outdated whitelisting
      tar: format 'ustar' cannot support UID/GID longer than 21 bits
      docs: issues with configure substitutions in TESTS
      tests: avoid possible autotools caching issues (automake bug#13832)
      tests: rename some with more descriptive names
      docs: add myself and Ralf Wildenhues as authors
      authors: add myself
      dry-run: don't get confused by '-I' option
      tests: avoid a spurious failure with the Korn Shell
      dry-run: with GNU make, prefer $(MFLAGS) over $(MAKEFLAGS)
      header vars: can determine whether we are running under GNU make
      NEWS: improve wording for automake bug#13514 fix
      NEWS: document fix for automake bug#13514

    + Extra non-trivial changes:

    * lib/am/header-vars.am: Ignore all upstream changes, we shouldn't
    need them.
    * t/make-is-gnu.sh: Remove; our generated makefiles have no need to
    test whether they are running under GNU make --- of course they are!

    Signed-off-by: Stefano Lattarini <address@hidden>