[FYI] Merge branch 'master' into ng/master

[Stefano Lattarini]

commit 90079e8bba596a39a145f46ea97988bf24f4867f
Merge: 7e693f2 4c39a5f
Author: Stefano Lattarini <address@hidden>
Date:   Sat May 11 01:38:51 2013 +0200

    Merge branch 'master' into ng/master

    * master:
      options: consistently use return statuses to report errors (more)
      options: try to report as much errors as possible
      warns: don't tell AM_PROG_MKDIR_P is going to be removed
      refactor: fix few "inverted boolean" usages
      options: better name for an internal function
      options: more consistency in use of return statuses to report errors
      options: tiny simplification in dealing with erroneous opts
      options: consistently use return statuses to report errors
      options: re-enable some sanity checks
      THANKS: update Eric Blake's e-mail address
      NEWS: typofix
      dist: remove support for shar and tarZ formats
      news: document new 'subdir-objects' warning
      PLANS: one minor fixlet (mostly cosmetic)
      PLANS: we have already dropped support for split info files in master
      NEWS: fix a reference to Automake 1.14 where Automake 2.0 was intended
      PLANS: fix reference to non-existent 'next' branch
      PLANS: fix botched version reference
      maintcheck: fix two references to old location of aclocal and automake
      dist: deprecated shar and tar+compress formats

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