HPCC-9307 initial work

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Refactor

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
x

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
checkpoint

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
checkpoint2

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>