Book Configuration -- Total points

[hosamshahin]

Book configuration object sent by the server to the client contains total_points fields for the entire book, chapters, modules, and sections. We need to properly display and maintain the value of these fields while instructors change exercises points. Note: These fields should be read only, it will help instructors to see and adjust the relative weights between chapters, modules, and sections. You don't need to send this fields back to the server.