CMS page implementation

[furilo]

• A user can visit a section, and she will be shown the first page of the section according to its hierarchy.
• A user can visit any page from a section.
• When a user visits a page, she will be shown:
  • The menu from the section, with the page's branch expanded, and the current page selected (with a class, according to the markup CMS page markup  #925 )
  • The breadcrumb, which is formed by: Section name + page hierarchy (ignoring root element)
  • The content of the page
  • A box with attachments, if they exist