Split off 4.2.x branch

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Graph Control 4.2.0-rc1 Release Candidate 1

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Graph Control 4.2.0-rc2 Release Candidate 2

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge remote-tracking branch 'origin/candidate-4.2.0' into closedown-4.2.x

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

Conflicts:
	version.cmake

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