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

[Stefano Lattarini]

commit 20cff0bd2db32b7a79f3162bab6aec618c554d13
Merge: 51403a6 78c4ba0
Author: Stefano Lattarini <address@hidden>
Date:   Mon Jun 25 10:49:49 2012 +0200

    Merge branch 'master' into ng/master

    * master:
      missing: don't cater to 'configure.in' in our advice
      missing: better tips about missing tools

    + Extra non-trivial edits:

    * lib/missing (autoheader*): Remove reference to 'acconfig.h',
    support for which has been removed in Automake-NG (see commit
    v1.12-263-gf94562c).

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