Gold Digger - modifications:

- Changed the controls from cursors and 0 to Q/A/O/P/space.
- Added an short sequence which will never be seen (legitimately...)
- Deliberately broke the game with the hole-digging routine! (It's impossible otherwise.)
- Added the ....AAAAAAAARGH.... from Demolition (ZX Computing Jun/Jul 1983).
- Really should have sorted out how fast the oxygen counter ticks down...

