…idation(): I was putting a letter in precinct column and in file source and it says "precinctColumnIndex must be an integer from 1 to 1000 if supplied: b", making it seem like the letter I had put in precinctColumn was b when it was something else ("b" was the file source dummy value I had used).

…umn and row indices as requested by @chughes297 (overriding what was in the original GUI mock-ups).

…hanges overvoteRule string display in config files and adds migration logic.

…hold` except when `winnerElectionMode` is "Multi-winner allow only one winner per round" or "Multi-winner allow multiple winners per round" (fixes #500).

…rs labels from radio buttons so they can be programmatically defined.

…tly referenced in the GUI and validation warnings.