Pull values for conflict resolution from other sheets

[nmalkin]

Right now, to do conflict resolution, we copy the code values from different sheets into a single one (assuming the original coding was done in separate sheets, which is the preferred way of doing things.)

It seems that it would be nice to avoid this manual copy/paste step.

[nmalkin]

Note, however, that this has some benefits, in that it keeps a copy of the original codes while allowing any after-the-fact modifications (typo correction, missed cells, etc.).

If we do implement this, it would be nice to keep it relatively easy to make changes like that: hopefully not having to switch back to the original sheet and look for the cell.