//TODO: code review :: seems like we should extend or implement something ?
I've added "implements BynaryFunctionDouble" bacause makes sense.
But this class needs to be understood against original C++ code and eventually more changes will be needed.
Class BivariateNormalDistribution dissapeared in QL 0.9.7, being substituted by BivariateCumulativeNormalDistributionDr78 BivariateCumulativeNormalDistributionWe04DP
Please refactor in order to comply to QL0.9.7
Kicked to v0.1.4
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I've added "implements BynaryFunctionD ouble" bacause makes sense.
But this class needs to be understood against original C++ code and eventually more changes will be needed.