Honor *SHOW-LISP-ERRORS-P* and *SHOW-LISP-BACKTRACES-P* when using ERROR...

Contrary to the docs the variables *SHOW-LISP-ERRORS-P* and *SHOW-LISP-BACKTRACES-P* were only in effect when error page was generated using COOKED-MESSAGE which is a fallback mechanism.

Another thought regarding *SHOW-LISP-BACKTRACES-P* is that, maybe, it doesn't make sense to generate them altogether if *SHOW-LISP-BACKTRACES-P* is NIL?