- improved help messages
- remove EXIT command, leaving just the QUIT command
- QUIT command now terminates a script recording session rather than
causing the debugger to quit
- renamed granularity to quantum. reframed all commentary/help
messages in these terms
- CARTRDIGE BANK prints error as appropriate
- removed HEXLOAD. functionality subsumed into POKE command
- DISPLAY DEBUG ON/OFF is now DEBUG MASK/UNMASK
o symbols
- fixed table listing
- using index instead of index into array (eye roll)
o cartridge / atari
- fixed bank switching boundary check
