Forward-porting from Zope 2.7.

The checkFullTimeStamp() test was sensitive to unique mktime() behavior
on FreeBSD.  See:

http://lists.freebsd.org/pipermail/freebsd-standards/2003-November/000268.html 

The purpose of this test is to exercise ZODB's TimeStamp object, so got
rid of dependence on platform mktime() and time.timezone quirks --
TimeStamp works in GMT, so how mktime() treats tm_isdst should be
irrelevant in all TimeStamp tests.

Also added a comment about the highly non-obvious numeric characteristics
of TimeStamp's treatment of seconds (round-tripping is surprisingly
inaccurate, but for a real reason).

If the system clock moved back in time more than 30 days between
a FileStorage close and (re)open, new txn ids could be smaller
than txn ids already in the database.  Plugged that hole.

New test checkRestoreWithMultipleObjectsInUndoRedo from ZODB 3.2.2.
3.3 didn't have the bug, and this confirms it.

move the release metadata for zpkg here from the CVS repository;
this was in Releases/ZODB3/ on cvs.zope.org

worker thread creates could cause mysterious exceptions in
*later* tests (when running all the tests, they appeared
to come out of checkDetail, which runs right after
checkMinimizeTerminates).  Changed the CantRidOfMe class
so that instances of the class *can* be gotten rid of,
keying off a new module bool.  The checkMinimizeTerminates
worker thread uses this to defang the objects after the
body of the test has completed.

In replace(), print feedback to stderr, since fileinput
hijacks stdout.

release, tried to make this script much more robust.  Use
r-strings for regexps.  Junk unnecessary code that a Unixhead
probably thought was needed for Windows (replacing forward
slashes in filepaths -- Windows accepts those too).  Made
the search criteria for NEWS.txt much looser (this is the
one we seem to blow most often).  Changed replace() in
several ways:  only replace the first occurrence of the
pattern (we never need more than that, and looser searches
are dangerous when replacing all occurrences); provide
feedback on everything done; if the pattern isn't found
at all, print a noisy msg saying so.  Completed the list
of modified files in the module docstring.

SAX stuff (that all comes with the minimum Python needed
to run ZODB now).

God knows it will get out of synch someday, but continuing to call
it version 0.3a2 is crazy.

Call it beta 1.  Recommend Python 2.3.4.  Retract the promise that ZEO incompatibilities will be fixed in
beta 1.

to the dead StandaloneZODB project at SourceForge.

cacheMeanDeal, and cacheMeanDeac methods from the DB class.  They
were untested, undocumented, unused, and did nothing of use (the
first always returned an empty tuple, the rest always returned None).

this should be automated by zpkg, but just name it specifically for now

- the implementation is a shim around the "persistent" package, so we need that
- the tests import a function from ZODB.util

error if zope.interface is not available
(the ZODB import is not checked at all, though)