- Display more debugging information when the plugin can't save the menu. Usually this is caused by server configuration problems. 
- Automatically remove consecutive submenu separators from the final menu. WordPress already does that for top-level menus, so it makes sense for us to do the same for submenus.

git-svn-id: https://plugins.svn.wordpress.org/admin-menu-editor/trunk@987062 b8457f37-d9ea-0310-8a92-e5e31aec5664