Fix double-precision version of builder #17
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Before this fix, cuBQL's default gpu builder always used single precision floats for finding the split position, even if input data was doubles. Since tree was eventually properly refit with doubles afterwards the trees were still correct (arguably why this wasn't found earlier), but this is still not as it was supposed to be. This patch fixes the 'AtomicBox<>' template to be properly specialized for ints, longlongs, and doubles.