3.2: (2006-02-01): r27892

    * Add 5 iteration methods to BTree.
      __reversed__() for reverse iteration of keys.
      items_backward() for reverse iteration of items.
      items_from() for iterations starting at a given key.
      items_backward_from() for reverse iterations from a given key.
      items_range() for iterations of items with keys in a given range.

    * Add __nonzero__ and setdefault methods to BTree

    * Change the name of BTree's get_count method to __len__.

    * Add setuptools support (when installed) to setup.py.

    * Remove convert_zodb.py script, rather than fix/maintain it.

3.1: (2005-10-18): r27556

    * Add PersistentSet.  (Applications that use the persistent_set
      must use Python versions >= 2.4).

    * Add MemoryStorage, an in-memory storage for testing purposes.

3.0: (2005-09-08): r27334

    * Fix bug in utility function (touch_every_reference()) added in 3.0a.

    * Replace ._p_changed = 1 to ._p_note_change() in btree.py.

3.0a: (2005-08-09): r27118

    * Revise packed record format to write records where the instance state is 
      compressed using zlib.  This reduces the size of stored files and the
      number of bytes of data transmitted during load/store operations.

    * Add a FileStorage2 file format.  The new format does not need or store 
      transaction identifiers.  It also includes a pre-built index of the 
      object records written at the time of the last pack.  This results in
      a faster start-up.  Conversion is not automatic, though.
      A convert_file_storage.py is included with this release to make it simple
      to convert a file to either format.

    * Add stress testing client stress.py.

    * When the state of a ghost can't be loaded because it has been
      removed by a pack (from another connection), make the error be a
      ReadConflictError instead of a DurusKeyError.

    * Implement an incremental pack.  The storage server can now serve
      clients while packing the database.

    * Add gen_every_instance() utility to durus.connection.

    * Add touch_every_reference() utility function to durus.connection.

    * Remove the use of tids from Connection, ClientStorage, and
      StorageServer.  The StorageServer now sends STATUS_INVALID for
      requests to load object records that are known to be invalid for
      that client.  Change Storage.load() so that the return value is
      a tid-less object-record.  The client/server protocol also
      changes to stop transmitting tids as part of the response for
      sync and commit requests.  Storage.sync() now returns only a
      list of oids.  Storage.end() now returns None.

2.0 (2005-4-26) r26653:

    * The only change is in the license.  The new license is the GPL-compatible
      version of the CNRI Open Source License.

1.5 (2005-3-07) r26296:

    * A small change makes Persistent instances pickle-able.

1.4 (2005-1-14) r25851:

    * Revise serialize.py to avoid using cPickle.noload(), which can't handle
      a dict subclass.

    * Add a --startup option to the durus command line tool.

1.3 (2004-12-10) r25746:

    * Use 'b' in file modes.  
      
    * Continue to rename the open packed file on POSIX systems.

    * Convert tests to sancho's new utest format.

    * Improve test coverage for FileStorage.

    * Lower the priority of Sync logging.
    
    * Show host and port when client fails to connect.

1.2 (2004-09-08) r25044:

    * Add durus command line tool.

    * Add btree module.

    * Update pack() so that it works on Windows and so that it gets a lock 
      again after the pack is completed. 

1.1 (2004-08-05) r24872:

    * Provide a close() method for FileStorage.  Call appropriate win32
      unlock function.

    * Remember to lock the new file created by pack().  Unlock the
      old file.


1.0 (2004-07-31) r24846:

    * Fix obscure bug in storage_server during logging.

    * Repaired example in README.txt.

    * Added FAQ.

    * Made ProtocolError inherit from DurusError.

    * Added fsync() after writing transaction data.


0.1 (2004-07-27) r24791:

    * Initial Release 
