Add a "find rarities" analog to "Verify against checklists..."

[Adam Winer]

Handy for double-checking imports to make sure a rarity wasn’t accidentally created.

[scythebill]

Resolve Issue #508 Added a "Find checklist rarities..." menu option which identifies any sightings that correspond to checklist rarities. Very useful for double-checking sightings and the checklists.

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