Estimate the logarithm of the polytope volume in CB algorithm #157
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This PR computes the logarithm of the telescopic product in the Cooling Balls algorithm, i.e. a telescopic sum.
With this improvement, we avoid potential over- or under-flows.
The PR changes the C++ tests and the R interface accordingly. In the R interface the volume function returns a R list with two elements: (a) the logarithm of the estimated volume, (b) the estimated volume.