delhndlr/TODO

1. Change to delkey.erase.bk
2. Add delkey.reset
3. If not delete key then forward to previous keyboard routine
4. Don't change cursor. Keep whatever cursor exists at load time.
5. Create program to detect if the handler is loaded: delkey.detect?.
6. Add program to print explanation and instructions.
7. Change subroutines to macros
8. Implement a better test for 80-column mode, possibly check cursor; if is delete char then 40-column mode
9. Add build and run instructions, explanation