Check import logic for spuhs

[Adam Winer]

An import of Sedge/Marsh Wren, Cistothorus platensis/palustris (with the old sci. name of Sedge Wren) should probably generate:

• Sedge/Marsh Wren in the US
• Sedge/Grass/Marsh Wren in Mexico
• Grass/Marsh Wren everywhere further south

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[Adam Winer]

FWIW, “Grass/Marsh Wren everywhere further south” is a weird example, since Marsh Wren doesn’t occur further south… but that’s still what should happen (and would apply for other pairs like this).