Add an "Oriental region"

[Adam Winer]

That would be, per https://www.orientalbirdclub.org/what-we-do

• the Indus river, Pakistan in the west through India and south-east Asia
• the Wallacea line, East Indonesia in the east, and from
• Mongolia, north-east Russia (E of 90°E) and Japan in the north
• the Lesser Sundas and Christmas Island in the south

[Adam Winer]

Resolve Issue #487: Add an "Oriental region". And also resolve some issues with synthesized checklists and Indonesia that have been present ever since the Asia/Australasia checklist split.

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