Weaken assertions

dune/tectonic/myblockproblem.hh

@@ -132,7 +132,7 @@ template <class MyConvexProblemTypeTEMPLATE> class MyBlockProblem {
     psi.subDiff(0, D);
     if (D[1] > 0) {
       // NOTE: Numerical instability can actually get us here
-      assert(std::abs(D[1]) < 1e-13);
+      assert(std::abs(D[1]) < 1e-12);
       return 0;
     }