Reverted changes made for supporting full_group_by in the custom viewlists.
- Also simplified SELECTs whereever possible. - Custom VLs with VOG as the first table (Variant VL on Screenings VE and Individual VE) no longer show the minimal VOT's effectid, but instead the VOG's effectid, which makes much more sense. - These changes might also lead to some speedups.
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