Changed the JPetAnalysisModule::GetEventNb to const method (changed also in ScopeModule)
Changed the JPetAnalysisModule::GetEventNb to const method (changed also in ScopeModule)


Former-commit-id: 43137068487dc6cb99dee59d1faebd04170635c7
alexkernphysiker/j-pet-framework,wkrzemien/j-pet-framework,wkrzemien/j-pet-framework,wkrzemien/j-pet-framework,wkrzemien/j-pet-framework,JPETTomography/j-pet-framework,alexkernphysiker/j-pet-framework,alexkernphysiker/j-pet-framework,wkrzemien/j-pet-framework,JPETTomography/j-pet-framework,JPETTomography/j-pet-framework,alexkernphysiker/j-pet-framework,alexkernphysiker/j-pet-framework