Internal function, logsum (copied from coloc package)
This function calculates the log of the sum of the exponentiated logs taking out the max, i.e. insuring that the sum is not Inf
ie, you want sum(x), but have x already stored in logs. log(sum(exp(x))) might fail, but logsum(x) should work.
max(x) + log(sum(exp(x - max(x))))
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