+ * enhancement: backtrace improvements
+ ** secondary CLOS dispatch functions have better debug names (lp#503081)
+ ** easier to read method names in backtraces. See
+ SB-DEBUG:*METHOD-FRAME-STYLE*.
+ ** SB-DEBUG:PRINT-BACKTRACE and SB-DEBUG:LIST-BACKTRACE are available as
+ forwards-compatible replacements for SB-DEBUG:BACKTRACE and
+ SB-DEBUG:BACKTRACE-AS-LIST.
+ ** SB-DEBUG:*SHOW-ENTRY-POINT-DETAILS** has been deprecated, as the same
+ information is available in less intrusive form as frame annotations.