GraspCandidate: added groupNr, providerName

source/RobotAPI/interface/units/GraspCandidateProviderInterface.ice

@@ -87,6 +87,8 @@ module armarx
             float graspSuccessProbability;
 
             ObjectTypeEnum objectType;
+            int groupNr = -1; // used to match candidates that belog together, e.g. from the same object or point cloud segment
+            string providerName;
 
             GraspCandidateSourceInfo sourceInfo; // (optional)
             GraspCandidateExecutionHints executionHints; // (optional)