* status codes returned by ferret_query_F
* negative codes are FERRET status codes ferr_xxx...

	INTEGER
     .       QSTAT_OK,
     .       QSTAT_UNKNOWN_QUERY,
     .       QSTAT_BUFF_OVFLOW,
     .       QSTAT_INVALID_ARG,
     .       QSTAT_INTERNAL_ERROR

	PARAMETER (
     .       QSTAT_OK = 0,
     .       QSTAT_UNKNOWN_QUERY = 1,
     .       QSTAT_BUFF_OVFLOW = 2,
     .       QSTAT_INVALID_ARG = 3,
     .       QSTAT_INTERNAL_ERROR = 4 )

