[WIP] GPU usage for calculating stats #79
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GPU is used for computing the statistics for
Sample, if the size is greater than a configurable threshould (defaults has to be determined).If no CUDA compatible GPU is available, all computations are done on the CPU.
Usage of GPU can be disabled with the environment variable
GFOIDL_STOCHASTICS_USE_GPUset to0.The use of the GPU can be forced when the aforementioned env-variable is set to
force, i.e. the computation is performed on the GPU without consulting the threshold.Fixes #77