SDDS_table: Address of the SDDS_TABLE structure for the data set.
column_name: A NULL-terminated character string giving the name of the column to return.
return value:
On success, returns the address of a newly-created copy of the ``rows of interest'' from the named column.
This array has type data-type*, where data-type is the data type of the
column. Note that for type SDDS_STRING, data-type is char *.
The number of rows is available from SDDS_CountRowsOfInterest.
On failure, returns NULL and records an error message.