gtCalculateGrain: converted output to be multiple-detector friendly

4_grains/gtCalculateGrain.m

4_grains/gtCalculateGrain_p.m

7_fed/gtFedGenerateRandomGrain.m

8_optimization/gtOptimizeFull.m

8_optimization/gtOptimizeTuneDetector.m

8_optimization/gtOptimizeVerticalDetector.m

zUtil_Drawing/gtPlotMultiUVW.m

zUtil_ForwardSim/gtForwardSimulate_v2.m

zUtil_ForwardSim/gtFwdSimGetIndexterReflections.m

zUtil_ForwardSim/gtFwdSimPredictProjectedGrainBBox.m

zUtil_ForwardSim/gtShowFsim.m

zUtil_Maths/findOnDet.m

zUtil_Twins/gtTwinForwardSimulate.m