If requested always print version and exit.

Previously this was only done if there were no other parameters on the
command line. That approach feels a bit unusual.

flow/flow.cpp

@@ -99,14 +99,14 @@ namespace detail
     // the call is intercepted by this function which will print "flow $version"
     // on stdout and exit(0).
     void handleVersionCmdLine(int argc, char** argv) {
-        if (argc != 2)
-            return;
-
-        if (std::strcmp(argv[1], "--version") == 0) {
+        for ( int i = 1; i < argc; ++i )
+        {
+            if (std::strcmp(argv[i], "--version") == 0) {
                 std::cout << "flow " << Opm::moduleVersionName() << std::endl;
                 std::exit(EXIT_SUCCESS);
             }
         }
+    }
 
 }