avoid integer overflow in bin(...) expressions
avoid integer overflow in bin(...) expressions

To convert bin numbers back into bin boundary values, the old code did:

    minv + (maxv - minv) * bnum / nbins::float

to avoid an intermediate product that can go out of range, change to:

    minv + (maxv - minv) * (bnum / nbins::float)

informatics-isi-edu/ermrest,informatics-isi-edu/ermrest