Added an option to disallow cross-database references.

debugging easier.

Include extra data in InvalidObjectReference exceptions to make
debugging easier.

Added an option to disallow cross-database references.

did not necessarily increase for every transaction.  Fixed and tested.

object can now *also* be used as an object with attributes mapped to
the root-object keys.

support.

  Python (2.5 and later) with statement::

db = ZODB.DB(...)
     with db.transaction() as conn:
          # ... do stuff with conn

This uses a private transaction manager for the connection.
  If control exists the block without an error, the transaction is
  committed, otherwise, it is aborted.

- Connections now have a public ``opened`` attribute that is true when
  the connection is open, and false otherwise.  When true, it is the
  seconds since the epoch (time.time()) when the connection was
  opened. This is a renaming of the previous ``_opened`` private
  variable.

output.

convenient way to open a connection to a database.  They open a
database and return a connection to it. When the connection is
closed, the database is closed as well.

messages.

the time zone definition, only worked on Unix.

under Python 2.6

using hashlib.sha1 if available in order to avoid DeprecationWarning
under Python 2.6

under Python 2.6

The zeopack script has gotten a numner of improvements:

- Simplified command-line interface. (The old interface is still
    supported, except that support for ZEO version 1 servers has been
    dropped.)

- Multiple storages can be packed in sequence.

- This simplifies pack scheduling on servers serving multiple
      databases.

- All storages are packed to the same time.

- You can now specify a time of day to pack to.

- The script will now time out if it can't connect to s storage in
    60 seconds.

- It now has a test. :)