navigation MDL-22044 Major navigation structure changes.
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.
blocks/global_navigation_tree/block_global_navigation_tree.php → blocks/navigation/block_navigation.php
blocks/global_navigation_tree/lang/en/block_global_navigation_tree.php → blocks/navigation/lang/en/block_navigation.php