checksum generation can be selected from command line (--checksum)

programs/fileio.h

@@ -49,6 +49,7 @@ void FIO_setNotificationLevel(unsigned level);
 void FIO_setMaxWLog(unsigned maxWLog);     /**< if `maxWLog` == 0, no max enforced */
 void FIO_setSparseWrite(unsigned sparse);  /**< 0: no sparse; 1: disable on stdout; 2: always enabled */
 void FIO_setDictIDFlag(unsigned dictIDFlag);
+void FIO_setChecksumFlag(unsigned checksumFlag);
 
 
 /*-*************************************