* minor incompatible change: SB-THREAD:JOIN-THREAD-ERROR-THREAD and
SB-THREAD:INTERRUPT-THREAD-ERROR-THREAD have been deprecated in favor
of SB-THREAD:THREAD-ERROR-THREAD.
+ * new contrib module: SB-QUEUE provides thread-safe lockless FIFO queues.
* new feature: docstrings for local and anonymous functions are no longer
discarded. (thanks to Leslie Polzer)
* new feature: SB-THREAD:SYMBOL-VALUE-IN-THREAD provides access to symbol