catch all exceptions in all tutorials and examples

examples/sim_2p_incomp.cpp

@@ -71,6 +71,7 @@ namespace
 // ----------------- Main program -----------------
 int
 main(int argc, char** argv)
+try
 {
     using namespace Opm;
 
@@ -300,3 +301,7 @@ main(int argc, char** argv)
     }
 
 }
+catch (const std::exception &e) {
+    std::cerr << "Program threw an exception: " << e.what() << "\n";
+    throw;
+}