Display the stack when there is an error

[RobLoach]

This isn't really that pretty, but does display the lineNumber.... References #1113

Alternatively, we could get the linenumber by using....

              // If thrown is a valid error message, retrieve the stack for it.
              if(duk_is_error(duk, -1) == 1)
              {
                duk_get_prop_string(duk, -1, "lineNumber");
                machine->data->error(machine->data->data, duk_safe_to_string(duk, -1));
                duk_pop(duk);
              } else {
                machine->data->error(machine->data->data, duk_safe_to_string(duk, -1));
              }

We would have to make sure we have the error message in there too though, which would need some concat strings.

[nesbox]

great. thank you