[FYI] Merge branch 'maint' into master

[Stefano Lattarini]

commit dc4eaab21b45b6b1fe4348db603380dd9681d5c3
Merge: 820d909 96b1303
Author: Stefano Lattarini <address@hidden>
Date:   Tue Apr 30 16:24:41 2013 +0200

    Merge branch 'maint'

    * maint:
      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      maintcheck: remove outdated whitelisting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