WIP: FreeAccumulator for unit tests
Proposition for a way to clearly allow ComponentAccumulators to be deleted without error.
Create TestUtility.py defining FreeAccumulator. Use FreeAccumulator for SCT_Digitization config test.
This is intended to remove the need for acc.popPrivateTools(); acc.wasMerged() lines in unit tests which create but do not need to merge ComponentAccumulators.
Minor cleanup to SCT_DigitizationConfigNew_test.py.
Q:
Does this give enough clarity?
Is there a better location, such as inside ComponentAccumulator class?
Should acc be returned?