new default option

NonLinearSolver/modelReduction/Tree.cpp

@@ -1403,7 +1403,8 @@ bool Tree::removeLeavesWithZeroContribution(double tol)
       Msg::Error("removeLeavesWithZeroContribution: maximal number of iterations (%d) reaches", maxIterRemove);
       Msg::Exit(0);
     }
-    bool okLeaf = removeZeroBranches(tol);
+    //bool okLeaf = removeZeroBranches(tol);
+    bool okLeaf = removeZeroLeaves(tol,true);
     bool okMerge = treeMerging();
     // check
     if (okLeaf || okLeaf)