Copy SafeClipping into new Coaddition super task. Leave old version in for now, for backwards compatibility.
Per discussion of 2017-06-05 with Yusra AlSayyad & Jim Bosch, we expect this ticket to be done effectively simultaneously with DM-9610.
There are two interpretations of this ticket and it's Done by both interpretation:
1) Before Gen3, we had workarounds planned to be able to generation multiple flavors of coadds in one repo in Gen2 (DM-9610). Gen3 solved the end goal, making the workarounds unnecessary.
2) SafeClipAssembleCoaddTask can now be run as a Gen3 PipelineTask (f.k.a. "supertask" when this ticket was written).