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).

intend real implementations to work, and beefed up the tests
to match.  The collaboration also got a little simpler.

New interface IResourceManager intends to combine the
best aspects of IDataManager and IDataManagerOriginal,
and will become "the" interface.
New interface ISavePoint captures (along with models in
collaborations.txt) what should be a clean design for a
savepoint/rollback facility that actually works.

Updated an old collaboration to reflect the change.

are in now (partly ZODB 3, partly ZODB 4, partly transitional).
More is needed.
Added new collaborations.txt, which spells out some dynamics
of the system in a compact way.  This is in a format Jim used
for Zope 3, essentially a flat-text and less-formal representation
of UML sequence diagrams.

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and include that in the ZODB project.  While we're at it,
include zope.testing too, as zope.interface depends on that,
and we had copied zope.testing.loggingsupport.py into ZODB
earlier anyway (and delete that unique copy here now).

This also merges some changes made to the ZODB copy in
Zope3 back into ZODB.

Collector 1327:  FileStorage init confused by time travel

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.

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.

3.3 didn't have the bug, and this confirms it.

(identical to revision 25416 on the ZODB-3.3 branch, but svn would not merge
the change)

(equivalent to revision 25293 on the ZODB 3.3 branch, but not a merge, since
the files were added separately after the branch was made)

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

this was in Releases/ZODB3/ on cvs.zope.org