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

[Stefano Lattarini]

commit 4dfeef7f20c624c4f2d6225bd8277fa774f81687
Merge: f6ce19b 2ef0a2d
Author: Stefano Lattarini <address@hidden>
Date:   Tue Jun 12 14:01:45 2012 +0200

    Merge branch 'master' into ng/master

    * master:
      maintcheck: fix failures, both real and spurious
      subdir tests: avoid an use of "make -j4", for portability
      tests: avoid failure due to libtool quirks in C++ demo test
      tests: fix spurious failures due to missing '$sleep'
      subdirs: unify rules for "cleaning" and "normal" recursive targets
      tests: add a "demo" test on C support
      tests: look for '.lo' rather than '.o' object when using Libtool with C++
      cosmetics: few typofixes in older ChangeLogs, suggested by "codespell.py"
      maint: grammar fixes: s/all these/all of these/
      subdir-objects: improve "make mostlyclean" efficiency and flexibility

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