crc: add crc16 kermit algorithm to standard crc algos that are available
crc: add crc16 kermit algorithm to standard crc algos that are available

digidotcom/python-suitcase,nateglims/python-suitcase,rtzoeller/python-suitcase,rtzoeller/python-suitcase,digidotcom/python-suitcase,nateglims/python-suitcase