Ensure that persistence machinery is tickled when __setitem__, __delitem__,
clear, and update are called on a transient object.

Also, use a distinct logger for error logging.

- Add "instance-local" "period" to TransientObjectContainer.  This allows
  users to dial a knob which may (or may not) reduce the number of conflicts
  that happen during heavy sessioning usage by reducing the frequency at
  which buckets potentially expire at the cost of expiration time
  accuracy.  Previously, this setting was hardcoded to 20 (seconds) at
  module scope.

- Add 'session-resolution-seconds' to zope.conf.in/zopeschema.xml to
  control instance-local period for /temp_folder/session_data.

- Update TOC UI, interface, and help files to deal with instance-local
  period.

- Update OFS/Application to deal with instance-local period for default
  /temp/session_data TOC.

- Use __setstate__ for TOC upgrade instead of a dedicated _upgrade method
  (it was too hard to figure out where to call _upgrade from and when to
  call it).

- Perform a few formatting changes that should make it easier to merge the 2.7
  branch with the HEAD going forward.  I beseech those who make formatting
  changes to a branch or the HEAD make them to the other at that time
  as well, especially with the SVN/CVS split it's very painful to do merging
  when there are non-substantive differences between HEAD/maint.  When I was
  a child, I never thought I would need to use the word "beseech", however, it
  has indeed happened.

Collector 1304: zopectl doesn't allow specification of zdrun effective user.

No commit message

     - Collector #1345: AcceleratedHTTPCacheManager now sends the
       Last-Modified header.

- Simple parameterization of BUCKET_CLASS for testing/debugging purposes.
  BUCKET_CLASS can be set to something like "dict" in order to isolate
  future problems potentially caused by OOBTrees (not that there seem
  to be any, but it's nice to be able to confirm).
                                                                                
- Log at INFO level in TLOG instead of BLATHER.
                                                                                
- Fix "off by one" error in _getCurrentSlices and explain.
                                                                                
- Add various DEBUG and TLOG statements for testing/debugging purposes.
                                                                                
- Arrange to compare against "default" instead of "_marker" in .get.
                                                                                
- Use random.uniform instead of random.choice to decide how to sleep.
                                                                                
- Use "_wrap" instead of directly calling __of__ for consistency.

Do logging only if Z_TOC_DEBUG environment variable is set.

Raise ConflictError from _p_resolveConflict instead of returning None if
conflict cannot be resolved.  I think someone changed the contract of
this method but the code hasn't caught up til now.

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Port mergeResults() tests

       splitlines() instead of split('\n').

docstring instead, as the new style suggests.

  - replaced old CVS expansion with a clean $Id$
  - set the svn:keywords property to "Id"

When you check-in files in the future and want $Id$ to be expanded,
make sure it reads "$Id$" in that file; then set svn:keywords to "Id".

ZODB, ZEO, Persistence and similar packages were not modified since they
are really maintained elsewhere. Right now, we use a copy of them in our
Zope/Zope3 trees. We should go back to the module sharing (using
svn:externals).

       in DA.py

connection can be holding on to an object with references to an object
that has been recently garbage collected.  When the object is unghosted in
the reference-holding thread, the storage cannot find the oid (because it's
out of storage due to gc).  We work around this by turning KeyErrors that
we believe are due to this scenario into ConflictErrors.

and closing a connection between each request.

New "Transience" implementation.  This implementation offers no new features,
but is is vastly simpler, which makes it easier to maintain.  The older version
used all sorts of (questionable) tricks to attempt to avoid conflicts and to
improve performance, such as using Python Queue-module queues to store action 
lists, using an index to quickly look up which "bucket" a transient object
was stored within and several other persistent objects which attempted to keep
pointers into the data.  The older version also had a lot of "voodoo" code in
it which papered over problems that was apparenly caused by its complexity.
This code is now removed/replaced and the implementation is fairly straight-
forward.

The newer version is probably much slower (due to the lack of an index, it
needs to scan all "current" buckets to attempt to find a value), but it 
operates reliably under high load. 

This implementation removes backwards compatibility support for transient
object containers persisted via the Zope 2.5.X implementation.  It is possible
to use it against instances created in Zope 2.6.X and better, and it
is possible after using it against a database created under one of these
flavors to move back to an "older" Zope in this range, although it is likely
that data in the TOC will be silently lost when this is done.

Added default configuration values to App.config

       Indexing errors are catched and logged. In addition the progress of the
       recataloging operation is logged. So one can see how much documents are
       already processed and how much documents are remaining.