HPCC-11463 Reintroduce usetmp parameter (which defaulted to false)

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #5906 from ghalliday/issue11463

HPCC-11463 Reintroduce usetmp parameter (which defaulted to false)

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>