There is currently a relatively useless calculation of an "effective gain" in the CCD assembly code. This presents a few issues: one is that it adds a piece of metadata that doesn't really add any information (the variance contains this information), and it makes the assembly require a variance plane which may not always make sense depending on when the CCD is assembled.

This is a suggestion to remove this calculation all together. This will require removing the assembleCcd.setGain config parameter.

The suggestion is to remove the setGain method from AssembleCcdTask, remove the setGain config parameter and any mention of it elsewhere.