Support generating BOU totals

[Adam Winer]

BOU splits some species that neither Cornell nor IOU do (Hudsonian Whimbrel, Bewick's Swan) and lump some that IOU split (Northern vs Hen Harrier) or both split (Eastern and Western Yellow Wagtail).

For those who's primary "ticks" are BOU-based, this is a major drawback to Scythebill.

[Adam Winer]

Not going to do this:

"20 January 2017

BOU to adopt the IOC World Bird List

The British Ornithologists’ Union (BOU) recognises the value of, and is keen to move towards, a standardised global avian taxonomy. As such we wish to adopt one of the current global taxonomies, and use this for all BOU activities, including the British List.

From 1 January 2018 the BOU will adopt the International Ornithological Congress (IOC) World Bird List for all its taxonomic needs, including the British List. This follows a detailed review by the BOU’s Records Committee (BOURC)."