SerialImagePointTransformer now has a factory method which removes identity transformations from the list (and does other minor optimizations).
Fixed imports.
Fixed test code in SerialImagePointTransformerTest.
Minor optimization in SerialImagePointTransformer.
Argument validation in CachingImageTransformationStep.
Reduced the length of a long line in CachingImageTransformationStep.
Upgraded wrapper to 1.6.
Using configuration on demand.
Merge branch 'master' into newdisplay
Deprecated TaskExecutors.upgradeExecutor.

The replacement methods are:
- TaskExecutors.upgradeToStoppable
- TaskExecutors.upgradeToUnstoppable
Merge branch 'master' into newdisplay