Merged from branches/slinkp-zopectl-exitcode-143813; fixes # 143813: zopectl should exit non-zero if child processes fail.

o See https://bugs.launchpad.net/zope2/+bug/143748

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Backport of fix committed to 2.10; see http://www.mail-archive.com/zope-checkins@zope.org/msg03128.html.

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The REQUEST should not accept holds after it has been closed.

Collector #1306: Missing acquisition context on local roles screen.

        errors

        
N.B.: updated 'zope.interface' package to Zope 3.2 branch;
      should be pinned to a tag or a release before releasing
      2.9.8).

Fix DateIndex date display; unpack stored integers into something meaningful. This fixes Collector #2316.

Repair (and simplify) tests in response to
http://www.zope.org/Collectors/Zope/2308.

Protect against setNumberOfThreads disappearing after first use.

Configure subscribers in code, not by loading ZCML.

Collector #2300: delimit *all* headers with CRLF; accumulated_headers and appendHeader use \n for delimeters and never get corrected on output

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