_GetPackage
sourcePackage = _GetPackage(sourceSolvableId);
targetPackage = _GetPackage(targetSolvableId);
BSolverPackage* package = _GetPackage(solvables.elements[i]);
BSolverPackage* package = _GetPackage(solvableId);
BSolverPackage* package = _GetPackage(solvableId);
sourcePackage = _GetPackage(sourceId);
targetPackage = _GetPackage(targetId);
BSolverPackage* _GetPackage(Id solvableId) const;