Release 2.4.2

- Added 'set_session()' method and 'autocommit' property to the
  connection. Added support for read-only sessions and, for PostgreSQL
  9.1, for the "repeatable read" isolation level and the "deferrable"
  transaction property.
- Psycopg doesn't execute queries at connection time to find the
  default isolation level.
- Fixed bug with multithread code potentially causing loss of sync
  with the server communication or lock of the client (ticket #55).
- Don't fail import if mx.DateTime module can't be found, even if its
  support was built (ticket #53).
- Fixed escape for negative numbers prefixed by minus operator
  (ticket #57).
- Fixed refcount issue during copy.  Reported and fixed by Dave
  Malcolm (ticket #58, Red Hat Bug 711095).
- Trying to execute concurrent operations on the same connection
  through concurrent green thread results in an error instead of a
  deadlock.
- Fixed detection of pg_config on Window. Report and fix, plus some
  long needed setup.py cleanup by Steve Lacy: thanks!
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