define variables instead of numbers about scriptsig size of coinbase tx
/** The maximum allowed size for scriptSig in vin of coinbase transaction, in bytes */ static const unsigned int MAX_COINBASE_TX_VIN_SCRIPTSIG_SIZE = 100;
/** The minimum allowed size for scriptSig in vin of coinbase transaction, in bytes */ static const unsigned int MIN_COINBASE_TX_VIN_SCRIPTSIG_SIZE = 2;