(breaking): use crc16 for writeblock command instead of cks_add8 #5
Description
cks_add8() is dumb and only used for <SID_FLASH> <SIDFL_WB> ... <CRC> frames. Using the crc16 code we already have anyway would eliminate some code, at the cost of 1 more byte to transfer per chunk.
This change would need to be done in nisprog at the same time. ( fenugrec/nisprog#12)