Catch all exceptions not caught in exiv2 cli-tool

It effectively looks the same as before, only now we don't call abort() but
instead clean up everything gracefully.

src/exiv2.cpp

@@ -146,31 +146,37 @@ int main(int argc, char* const argv[])
         return 0;
     }
 
+    int rc = 0;
+
+    try {
         // Create the required action class
         Action::TaskFactory& taskFactory = Action::TaskFactory::instance();
-    Action::Task::AutoPtr task
+        Action::Task::AutoPtr task = taskFactory.create(Action::TaskType(params.action_));
-        = taskFactory.create(Action::TaskType(params.action_));
         assert(task.get());
 
         // Process all files
-    int rc = 0;
         int n = 1;
         int s = static_cast<int>(params.files_.size());
         int w = s > 9 ? s > 99 ? 3 : 2 : 1;
-    for (Params::Files::const_iterator i = params.files_.begin();
+        for (Params::Files::const_iterator i = params.files_.begin(); i != params.files_.end(); ++i) {
-         i != params.files_.end(); ++i) {
             if (params.verbose_) {
-            std::cout << _("File") << " " << std::setw(w) << std::right << n++ << "/" << s << ": "
+                std::cout << _("File") << " " << std::setw(w) << std::right << n++ << "/" << s << ": " << *i
-                      << *i << std::endl;
+                          << std::endl;
             }
             int ret = task->run(*i);
-        if (rc == 0) rc = ret;
+            if (rc == 0)
+                rc = ret;
         }
 
         taskFactory.cleanup();
         params.cleanup();
         Exiv2::XmpParser::terminate();
 
+    } catch (const std::exception& exc) {
+        std::cerr << "Uncaught exception: " << exc.what() << std::endl;
+        rc = 1;
+    }
+
     // Return a positive one byte code for better consistency across platforms
     return static_cast<unsigned int>(rc) % 256;
 } // main