HPCC-10532 Serialize progress information so backward compatible.

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge branch 'issue10532' into candidate-4.2.0

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Community Edition 4.2.0-3 Gold

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge branch 'candidate-4.2.0' into candidate-4.2.2

Conflicts:
	version.cmake

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge branch 'closedown-4.2.x' into candidate-4.2.2

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge branch 'closedown-4.2.x' into candidate-4.2.2

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Community Edition 4.2.2-rc3 Release Candidate 3

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge remote-tracking branch 'origin/candidate-4.2.2' into closedown-4.2.x

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>