prettier backtraces

prettier backtraces

  Introduce PRINT-BACKTRACE and LIST-BACKTRACE as forward compatible
  replacements for BACKTRACE and BACKTRACE-AS-LIST. (Not yet deprecated.)

  *SHOW-ENTRY-POINT-DETAILS* is also deprecated. Function names and
  lambda-lists are now always cleaned, but the details that were
  previously available via the debug name are now provided as part of
  the auxilliary frame info.

  *METHOD-FRAME-STYLE* can be :MINIMAL, :NORMAL, or :FULL, defaulting to
  :NORMAL.