John Cupitt e81900b187 bandjoin is just an instance function
we had both a class member bandjoin, and an instance member

Vips.Image.bandjoin([i1, i2, i3..])
i1.ibandjoin([i2, i3..])

this was confusing and annoying ... get rid of the class one and just
use bandjoin everywhere, so this is now the way to do it:

i1.bandjoin([i2, i3..])
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