[FYI] Merge branch 'maint' into master

[Stefano Lattarini]

commit 106428fe4e73d5f9f5e7cc2e44a1e9b3b85606c1
Merge: 06143bd 7d6b274
Author: Stefano Lattarini <address@hidden>
Date:   Thu Jul 26 18:16:47 2012 +0200

    Merge branch 'maint'

    * maint: (38 commits)
      maintcheck: fixup list of files in $(xdefs)
      tests: never source test-defs.sh directly, source test-lib.sh instead
      runtest: sanitize test environment
      tests: remove an obsolescent self test
      tests: "am_using_tap=yes" -> "am_test_protocol=tap"
      tests: protect test libs against multiple inclusion
      configure: testsuite shell can return early from "dot-sourced" files
      tests: move sanitization and "Bournification" in the generic test lib
      tests: source test defs in the generic test lib
      test defs: no need to re-add $srcdir/t/ax to $PATH
      tests: split test libs into "generic" and "automake-specific"
      test setup: move actual calling of testsuite setup in ./defs
      test setup: merge definitions of function for simple tests
      test init: refactor: new function 'am_test_setup'
      test init: refactor: move displaying of debugging info later
      test init: refactor: new function 'am_setup_testdir'
      test init: refactor: new function 'am_set_exit_traps'
      configure: testsuite shell set exit traps in shell functions
      test init: refactor: new function 'am_exit_trap'
      test init: refactor: new function 'process_requirements'
      ...

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