New branch that should allow the user of PRISM to choose if they want to use OpenCL implementation or not.
Added the -opencl option. When doing transient analysis of stochastic system using the sparse engine, the opencl implementation is used iff the -opencl flag is provided.
The PS_StochBoundedUntil and PS_StochCumulReward now also benefit from the fox-glynn parallelization.
Renamed FGKernel to FoxGlynn_OpenCL