Section 0 is now only shown in the navigation block if it contains
activities.
If there are no activities then the section is removed.
This mimicks the display on the course page.
In the default course settings, setting the maximum number topics / weeks to 0 would not
change the default number of sections on the same page as any other number would.
A more appropriate check has been put in place.
This also incorporates a fix for MDL-28584. The course edit screen now also checks to see
if maxsections is set or numeric. If it is not set or numeric then it defaults to 52.
Initially, the default section title was swapped within the course format
javascript functions. Though some section titles may be custom and does not
require swapping, in addition they may have links to single section view. This
introduces some callback functions for define what needs to be done in
sections libs and js files.
Navigation has now been re-ordered in accordance with http://docs.moodle.org/en/Development:Navigation_2.0_structure.
This has led to several changes in the way in which navigation is generated included API changes, most notably using the
navigation_nodes add method now returns the newly added node rather than the key.
At the same time the global_navigation_tree block has been renamed to navigation and settings_navigation_tree to settings.
This patch introduces two new blocks global_navigation_tree and settings_navigation_tree
both of which have been designed to make full use of the new navigation objects available through
the $PAGE object.
Bulk of this code is within lib/navigationlib.php
