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Update catalog metadata for tropical Africa tiles (west/central/east-africa)
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Update catalog manifests for canada-alaska tile
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groups.json: western-palearctic in europe
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Add 8 more island tiles: Madeira, Azores, Galapagos, New Caledonia, Cape Verde, Sao Tome & Principe, Seychelles, Mauritius; island-mode coverage maps
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Add 5 small-island tiles: Iceland, Svalbard, Canary Islands (Europe), Reunion (Africa), Hawaii (Oceania)
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Group regional catalog by continent (Europe/Asia/NA/SA/Africa/Oceania); add groups.json + group fields in metadata.json
