Contains two checksum values, one for the header code at LBL, and the other
for the recursive token table from &0400 to &07FF.
.MAINSUMEQUB&CB\ This is the checksum value of the decryption header\ code (from LBL to elitea) that gets prepended to the\ main game code by elite-bcfs.asm and saved as\ ELThead.binEQUB0\ This is the checksum value for the recursive token\ table from &0400 to &07FF. We calculate the value in\ elite-checksum.py, so this just reserves a byte