card stress/scan test
continuously scans a card counting single & double bit errors as
well as blocks that are marked bad in the spare area.  It displays
the block numbers of each kind of block (up to ~18 of each type)
Automatically restarts when a new card is plugged in.

If compiled with DESTRUCTIVE #defined then it writes to all blocks
that are good (no double bit error && not marked bad) and reads back
the result.  It won't write blocks that have double bit errors that
are NOT marked bad.  Destructive version of test doesn't start scan
until the starting card is removed and another card is plugged in,
but IT WILL start a new destructive scan for any card plugged in.

When compiled in the destructive mode it will display a title on
the TV indicating it is running in destructive mode