EVAL/EVAL-WHEN/%COMPILE/DEFUN/DEFSTRUCT cleanup:
** made inlining DEFUN inside MACROLET work again
* incompatible changes listed in NEWS:
- ** changed debugger prompt to "5]", "5[2]", "5[3]", etc.
** changed default output representation of *PRINT-ESCAPE*-ed
unprintable ASCII characters to #\Nul, #\Soh, etc.
-* some easy FIXMEs with high disruptive potential:
- ** Search lists go away.
- ** Grep for ~D and and change most of them to ~S.
* more renaming in global external names:
** used DEFINE-THE-FOO-THING and DEFFOO style consistently (and
deprecated supported extensions named in the DEF-FOO