3.0.8
- no code changes, same as 3.0.7, except the stub file prints version
  and changelog information previously on the website

3.0.7
- client/server expression cursor fix

3.0.6
- the patch for 3.0.5 was really 3.0.4, on some platforms; fix this
  by bumping the version number and releasing a new patch on all
  platforms.

3.0.5
- delete-instance and unique indicies

3.0.4
- Prevent multiple opens of the same db

3.0.3
- fix client/server access of compressed index

3.0.2
- improve speed when modifying an index

3.0.1
- fix node compression bug in btrees

3.0.0
- Add compressed indexes to reduce disk footprint for read only databases.
- Add regular expression to expression cursors.
- More fixes for SMP safety, this time to the underlying btrees.

2.2.3
- Fix create-index-cursor if preread was specified and if the index
  file to read had been temporarily closed to reduce the number of
  files open.

2.2.2
- Improvements for SMP safety.

2.2.1
- The maximum message size was increased from 20,000,000 bytes to
  40,000,000.

2.2.0
- A preread argument was added to create-index-cursor to greatly speed
  up an scan of a index that will touch most pages in the btree.
- A max-fds argument was added to start-server so you can ensure that
  AllegroCache doesn't run out of file descriptors if you have many
  indexes and/or maps.
- Note that the client/server protocol has advanced to '5' meaning
  that client code will need to talk to a server using this latest
  code. However old clients will be continue to work with this new
  server.

2.1.23
- Now you can now quickly scan an index an find all of the unique
values. The documention for create-index-cursor shows an example of
how this can be done.


2.1.22
- Rollback will now undo the changes made to instances due to a
changed class, so that the instance is reverted to the previous
state and marked as from a previous version of the class.  Then when
the instance is next referenced the update process will be done
again.
- The database format is unchanged.


2.1.21
- Change the logmaster structure and logic to take into account the
  presence of the :read-only flag for open-file-database. Now,
  logmaster opens log files with :direction :input in read-only
  databases.
- create-expression-cursor has been documented to return nil if there
  are no values to return.  However there was a problem where an error
  was signalled inside the server instead.  This problem has been
  corrected.
- Improve the performance of client/server operations by retrieving
  the approprite instance vector in one round trip rather than two.
- If the database is opened read-only then ensure that the index
  btrees are also opened read-only as well.  Previously we would avoid
  writing to the indexes in read-only mode but we did open the files
  in read/write mode.

2.1.17
- Prevent a "No applicable methods" error inside get-new-class-cursor
  when creating by checking whether the dash-class-backend-class for
  that given class exists. This would happen when creating class
  cursors for classes that had only uncommitted instances.
- Previously, AllegroCache signaled a non-simple error when connection
  to the AllegroCache server broke down during a request. Now,
  AllegroCache will signal a network-communication-error condition.
- AllegroCache now correctly loads and preserves :type information on
  slots of persistent classes. If the type is no longer a type
  specifier (e.g. loading a database in another image that doesn't
  have this type defined), AllegroCache will reset the slot type to T.
- AllegroCache no longer discards :documentation on persistent classes
  and their direct slots.
- The print-object method used to write "not modified" for maps that
  had new values added or old ones removed. Use the map-modified slot
  to check for modifiedness of ac-maps now.
- Previously, (rollback) would only roll back changes to instance of
  ac-map itself, not any user-defined subclass. This change ensures
  that any subclasses of ac-map get treated like ac-map itself does,
  like a user would expect.
- Allow specifying an :address argument to start-server which
  specifies the listening address to bind to. It can be either an
  internet address as a string, or a pathname object (to specify a
  unix domain socket).
- Allow open-network-database to connect to a unix domain socket, as
  well: specify a pathanme object as the hostname, and nil as the
  port.
- When opening a DB read-only, don't set up a write-buffer structure:
  Otherwise, when closing the DB, AC will attempt to flush the buffer,
  which used to lead to an error message.

2.1.13
- Fix problem with :use :memory when there are no class definitions
  loaded in memory yet.

2.1.12
- Handle OIDs larger than 29 bits.

2.1.11
- You can specify the maxinum number of file descriptors used to
  access index btrees.
- Fix a bug in doclass* where all subclasses were not scanned.

2.1.10
- A database can be opened in read-only mode. 
- Btrees can be opened in read-only mode.

2.1.9
- A call to return now works inside a doclass*. 
- In the btree module the replace hook again is enabled.
- Distributions are now being built for 64-bit ACL on Mac OS X Leopard.

2.1.8
- Now one can retrieve index values directly from the index with
  next-index-cursor and previous-index-cursor.
- For client/server users: you must update both the client and server
  in order to use this new feature.

2.1.7
- Fix bug in adding indexed objects across an authenticated connection.

2.1.6
- Fix bulk load bug where building the a fixnum index would cause Lisp
  to signal a segementation violation.

2.1.5
- permit ac-set to be subclassed
- More support for running without *allegrocache* being bound.

2.1.4
- slot reading and writing can be done without binding *allegrocache*
- Add the function database-of that returns the database connection
  associated with a persistent object.

2.1.3
- bulk loading now works in client/server mode.  To use this new
  feature you must update both the client and server.
- expression cursors - speed up the non-indexed case and fix a bug in
  freeing an index.
- fix a bug in deleting a modified map.

2.1.2
- Improve the speed of expression cursor indexes.
- reduce the consing on index lookups
- fix a bug index access.
- recover-from-log is now able to skip past bad entries at the end.

2.1.1
- Speed up fixnum index bulk loading for version 9 databases.  This
  slows down bulk loading for fixnum bulk indexes of version 8
  databases so be sure to upgrade old databases to version 9.
- Speed up recover-from-log for large databases with many indexes.
- Greatly reduce consing when doing index lookups
- Fix bug when redefining a class to eliminate an indexed slot


2.1.0
- Add expression cursors which can iterate over a set of instances
  that satisfy a predicate over multiple slots of an instance.
- Fix a bug in the storing of non-fixnum indexes in bulk loading mode.
- Database version is now 9, but this AllegroCache version will
  operate on either version 8 or version 9 databases.  See the section
  "upgrading databases" in the AllegroCache reference manual.

2.0.1
- Have client and server exchange information on the wire protocols
  they support and signal an error if they are incompatible.  It's
  best to run the same version of AllegroCache in the client and
  server but when that's not convenient this test will catch
  situations when the client of one version should not communicate
  with the server of another version.
- Add class cursor functions: create-class-cursor, next-class-cursor,
  and free-class-cursor
- Should an error occur when writing the transaction log that write
  will be retried up to 10 times.

2.0.0
- Add a bulk loading mode to allow objects to be added to the database
  quickly.
- The client-connections function always returns the current
  connection first (that is the connection used in the evaluation of
  the call to client-connections).
- Fix bug in maps when transactions couldn't commit and were forced to
  rollback.
- doclass will signal an error if the given class-name doesn't name a
  class.