Remove bogus debug output printing in MILU.

Somehow some standard output when running MILU () is still there and
it really clutters the output and and makes it unusable. This commit
removes it from flow.

opm/autodiff/ParallelOverlappingILU0.hpp

@@ -306,8 +306,6 @@ namespace Opm
             for(const auto& entry: sum_dropped)
             {
                 auto& bdiag = (*a_ik)[index][index];
-                if(entry<0)
-                    std::cout << entry << std::endl;
                 bdiag += signFunctor(bdiag) * entry;
                 ++index;
             }