message: Add AddTask for AliMCWeightsTask
diff: #include "AliAnalysisTaskBaseWeights.h"
  #endif
  -AliAnalysisTaskBaseWeights* AddTaskBaseWeights(const char* name = "TaskBaseWeights", const char* outfile = 0, const char* collisionSystem = 0, Int_t sysFlag = 0, const char* prevTrainOutputPath = 0, bool doSystematics = false, bool useMBfractions=false) {
  - return AliAnalysisTaskBaseWeights::AddTaskBaseWeights(name, outfile, collisionSystem, sysFlag, prevTrainOutputPath, doSystematics,useMBfractions);
  +AliAnalysisTaskBaseWeights* AddTaskBaseWeights(const char* name = "TaskBaseWeights",const char* outfile = 0, AliAnalysisTaskBaseWeights::CollisionSystem collisionSystem = AliAnalysisTaskBaseWeights::CollisionSystem::pp) {
  + return AliAnalysisTaskBaseWeights::AddTaskBaseWeights(name, outfile, collisionSystem);
  }
  