Changes since release 1.0
-------------------------

- The README recommend using 3.16.2rc1 or later.

- Using Spread 3.16.2, it now works on Windows.

- Changes to the test suite to make it less accident-prone.

- Fixed race conditions having to do with disconnects in
  multi-threaded programs.  When one of the errors CONNECTION_CLOSED
  or ILLEGAL_SESSION is received, mark the mbox as closed.  In
  addition, use a lock to serialize access to the disconnected flag.

- Fixed a memory leak that leaked about 50 bytes per mbox.receive()
  call.
