File gluon/contrib/pymysql/constants/FLAG.py from the latest check-in

NOT_NULL = 1
PRI_KEY = 2
UNIQUE_KEY = 4
MULTIPLE_KEY = 8
BLOB = 16
UNSIGNED = 32
ZEROFILL = 64
BINARY = 128
ENUM = 256
AUTO_INCREMENT = 512
TIMESTAMP = 1024
SET = 2048
PART_KEY = 16384
GROUP = 32767
UNIQUE = 65536