only do 1 iteration step, add debug print

dune/tectonic/spatial-solving/fixedpointiterator.cc

@@ -124,6 +124,8 @@ FixedPointIterator<Factory, NBodyAssembler, Updaters, ErrorNorms>::run(
   Vector total_v;
   nBodyAssembler_.nodalToTransformed(velocityIterates, total_v);
 
+  print(velocityIterates, "velocityIterates start:");
+
   for (fixedPointIteration = 0; fixedPointIteration < fixedPointMaxIterations_;
        ++fixedPointIteration) {
 
@@ -148,8 +150,11 @@ FixedPointIterator<Factory, NBodyAssembler, Updaters, ErrorNorms>::run(
     updaters.state_->extractAlpha(newAlpha);
 
     nBodyAssembler_.postprocess(total_v, velocityIterates);
+    //Rprint(velocityIterates, "velocityIterates loop:");
     updaters.rate_->postProcess(velocityIterates);
-    bool breakCriterion = displacementCriterion(updaters, last_u); //stateCriterion(alpha, newAlpha);
+    bool breakCriterion = true; //displacementCriterion(updaters, last_u); //stateCriterion(alpha, newAlpha);
+
+    printRegularityTruncation(globalFriction_, total_v);
 
     if (lambda_ < 1e-12 or breakCriterion) {
       fixedPointIteration++;
@@ -171,6 +176,8 @@ FixedPointIterator<Factory, NBodyAssembler, Updaters, ErrorNorms>::run(
   nBodyAssembler_.postprocess(total_v, velocityIterates);
   updaters.rate_->postProcess(velocityIterates);
 
+  print(velocityIterates, "velocityIterates end:");
+
   // Cannot use return { fixedPointIteration, multigridIterations };
   // with gcc 4.9.2, see also http://stackoverflow.com/a/37777814/179927
   FixedPointIterationCounter ret;