[FYI] Merge branch 'maint' into master

[Stefano Lattarini]

commit 19c5bd9fa8bbf9e46e37f93b864137e842c2adc2
Merge: 488de31 3a1a8c6
Author: Stefano Lattarini <address@hidden>
Date:   Fri Jun 22 14:52:21 2012 +0200

    Merge branch 'maint'

    * maint:
      tests: automatic re-execution works for non-POSIX shells too
      tests: use more POSIX shell features our test scripts

    + Extra non-trivial edits:

    * t/ax/tests-init.sh: Apply the diffs between past versions of
    'defs' in maint and in master; i.e., remove handling of $required
    entries 'texi2dvi-o' and 'makeinfo-html', and adjust to the fact
    that the parallel testsuite harness is now the default.

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