9. Commands at breakpoints.
11. Stepping mode.
17. Handle the "load" function properly in instrumented files.
20. Don't print redundant backtrace in Emacs mode?
28. Remove highlighting when debugging finished or interrupted.
29. Do proper reset when reloading files when debugger is in the middle
    of something.
30. Why does error throw away so many frames (debugging Scheme-0 evaluator)?
32. Make it less easy to accidentally exit the debugger.
33. Allow breakpoints on symbols and self-evaluating constructs?
34. Documentation needs index.

DONE

1. Clear bps.
2. Set/clear by function name.
3. Announce BP stop and BP setting.
4. Unify commands of two "top-levels" functions.
5. Better error recovery for commands with arguments.
10. Menu commands like gjdb.
12. Use more recent Elisp features for menus (menu-item ...).
13. Allow stepping to display returned values, too.
8. Conditional breakpoints
15. Handle ^C correctly.
14. Be less silent when expression evaluation finishes as a result of a
    'continue' or 'step'.
16. Add "Help" menu item.
19. Make backtrace look the same in Emacs and non-Emacs mode.
18. Clear breakpoints when file reloaded.
7. Integrate with our OOP stuff.
22. Get class & instance variables' values.
21. Add conditional breakpoints to menus.
0. DOCUMENTATION
23. Handle compiler intermediate files better.
24. Clean up prompts with Berkeley scm.
21. Don't wait for end-of-line.
25. Better buffer-switching on stkdb-debug-file.
26. Add 'debug definition' commands.
6. Better diagnostics for expressions evaluated by debugger top levels.
27. Use color-handling from more modern Emacs's.
31. Show local variables automatically in outer frames?