added section on *Add* and *Manage* menus in the Web Content section of the Control Panel
added explanation that using folders for web content articles can be very useful for sites with lots of content
updated most of 03-adv-web-content-management with new web content, structures, templates interface in control panel, need to finish by removing XML schema definition section and replace default values with predefined values
removed section on Structure Default Values and XML Schema definitions since it looks like this functionality is missing in 6.2
fixed transition from structures section to permissions on structures section
Merge pull request #369 from jrao/LRDOCS-349

https://issues.liferay.com/browse/LRDOCS-349