Restored the ._opened attribute of Connection.  Don't know why it went away
in 3.3.  Probably because it was only referenced by connectionDebugInfo(),
and Jeremy didn't realize anyone used that <wink>.

The DB.cacheStatistics() method was introduced in DB.py rev 1.2,
and has always returned an empty tuple.  A number of "never did
anything, probably never will" DB methods like that were removed
in ZODB 3.3, to reduce stumbling over decoys.  That was discussed
on zodb-dev at the time, with universal agreement to get rid of
them.

So the resolution in this case is changing Zope to stop trying
to access the no-longer-extant cacheStatistics() method.  If
someone doesn't like this, they can revert this patch, then
change App/CacheManager.py's cacheStatistics() to return a
hard coded empty tuple <wink>.

Caution:  Since no deprecation warnings about Transaction.begin()
were raised by the test suite before this patch, none of this code
is exercised by the test suite -- or it is, but "something"
suppresses the deprecation warnings.  So it's hard to claim that
this patch has been tested; the strongest claim I can make is that
all the unit tests still pass.

1. a_Transaction_object.begin() is deprecated.  Don't use it.

2. Commit failure is "sticky" now:  the current transaction
   must be explicitly discarded (abort() or begin()) before
   a commit can succeed again.

Collector #1457: ZCTextIndex's QueryError and ParseError are now available for import from untrusted code.

     - Collector #1491: talgettext.py did not create a proper header
       for the generated .pot file if multiple pagetemplate files
       were processed.

- Updated to use transaction.commit() rather than
  get_transaction().commit()

       same signature as str.strip()

No commit message

dd Michael Dunstan's "explicit abort after error propagates into publisher" patch as documented in http://zope.org/Collectors/Zope/789 and as required by recent changes to ZODB which prevent a connection from being cleanly closed if modifications are extant in that connection.

(Merge from 2.7 branch)

via distutils to a relative path.

(corresponds with ZopeX3-3.0 branch revision 27434)

in HTTPRequest.keys() - it caches URLN and BASEN in other.

- synced interface and help file with implementation

from 'guarded_getattr'.