catch all exceptions in all tutorials and examples

examples/compute_tof_from_files.cpp

@@ -73,6 +73,7 @@ namespace
 // ----------------- Main program -----------------
 int
 main(int argc, char** argv)
+try
 {
     using namespace Opm;
 
@@ -209,3 +210,7 @@ main(int argc, char** argv)
         }
     }
 }
+catch (const std::exception &e) {
+    std::cerr << "Program threw an exception: " << e.what() << "\n";
+    throw;
+}