(reported by Antonio Menezes Leitao)
* on X86 fixed bug 298, revealed by Paul F. Dietz' test suite: SBCL
can remove dead unknown-values globs from the middle of the stack.
+ * added a new restart to *BREAK-ON-SIGNALS* handling to make it
+ easier to resume long computations after using *BREAK-ON-SIGNALS*
+ to diagnose and fix failures (thanks to Nikodemus Siivola)
planned incompatible changes in 0.8.x:
* (not done yet, but planned:) When the profiling interface settles