- fixed a bug that crashed the programm when a popup button was scrolled.

- fixed a bug that caused incorrect drawing position of the popup indicator.
- fixed a bug that prevented selecting no item (-1) in a popup button.
- an assertion will be raised if the program tries to select a popup button
  item that is beyond the total number of items present in the popup button.
- changed names of functions for SplitView to be consistent. Some contained
  SubView while other Subview. Now all have Subview.

wrlib/view.c

@@ -62,4 +62,5 @@ int main(int argc, char **argv)
     XFlush(dpy);
 
     getchar();
+    exit(0);
 }