sense for Berkeley storages.

Update information about the version of Python required -- Python
2.2.2 fixed a bug that seriously affected some Zope installations that
used 2.2.1.

Update information about the version of Python required -- the trunk
is now in the new world (by Papal edict; don't shoot the messenger!).

for an object revision in objrevs got collected away when the entire
object was refcounted to zero.  Be more defensive about find and
deleting these records.

Also, truncate the packtime table before writing the new record, to
maintain the database invariant that there is only allowed one entry
in this table at a time.

*first* entry (and not the last one as assumed before).

- Adjust test to create a big file that will have a Pdata entry of smaller
  size

- Fix pdata_map lookups with first-entry-size in mind.

Remove unnecessary Py_FatalError() calls on failed module import.

Merged remaining changes from toby-clean-shutdown-branch. This resolves the overnight problem where storages were not closed if Zope is shut down using the ZMI, and the long-standing problem where storages were closed too soon when shut down using a signal

        the Zope profiling support

#include <string.h> is implied by ExtensionClass.h, because it includes
Python.h.  Also, it is an error to include standard headers before
Python.h.

#include <stdio.h> is implied by ExtensionClass.h, because it includes
Python.h.  Also, it is an error to include standard headers before
Python.h.

Bugfix candidate.

dont close the storages mid-transaction. need to check whether we need to close them at the end of z2.py

New `catdel' command which deletes the entire catalog in one
transaction.

Add a new global VERBOSE flag instead of passing around the printstat
argument everywhere.  This also lets us use getopt for proper option
parsing, and add a -v/--verbose flag for setting that global.

Added a usage() function.

two values are tainted failed because no implicit conversion to a list took
place.

between objects which are unreachable from the root -- and thus might
be collected by autopack -- and cycles which are unreachable from the
root -- which can only be collected by a full pack.

cycle deletion tests.

collect cycles.

Also, some code updating and re-org to factor code into the base
class.

_dostore(): Support conflict resolution.

__init__(), _withtxn(): Removed.

_decrefPickle(): Fixed a typo.

BerkeleyConfig: Clarify in the docstring the semantics of the various
autopack variables, w.r.t. the differences between Full and Minimal
autopacking (the latter always does a gc pack because there's nothing
else it /could/ do :).

__init__(): We can create the packlock here, allowing us to get rid of
the __init__'s in the derived classes.

_withtxn(): Turns out to be useful for both storages.

ThreadedAsync/LoopCallback.py: when select() is interrupted by a
signal handler, don't attempt to read all file descriptors.

in the setup.py script.

cache size, and other useful BerkeleyDB parameters.

attributes for controlling autopack behavior.

three new configuration variables for controlling how autopacking
works.  Basically, you set an autopack frequency, a "packtime" -- the
point in the past you want to pack to -- and a counter for
automatically doing a classic pack.

Specific changes here include:

_setupDBs(): If autopacking is enabled, create the autopacking thread
object and get it started.

close(): When shutting down the storage, we need to stop and join the
autopacking thread, otherwise I think we have a high possibility of
corrupting our database (requiring recovery).

_dopack(): Add a flag for whether full gc should be done or not.
That's about the only difference between classic pack and autopack
(the latter does not do gc).

autopack(): The method that the autopacking thread calls to start an
autopack.  It takes a pack time with the same semantics as pack(), but
it also takes a flag specifying whether to do garbage collection of
unreachable objects or not.

_Autopack: A derived class of threading.Thread to handing the
background autopacking.