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
This was all in order to do MDL-19889!
* The old tabbed interface is gone.
* The manage feeds UI has been completely rewritten to be a few
separate sane scripts like managefeeds.php, editfeed.php and viewfeed.php
* This is used from both Admin -> plugins -> blocks ... and as a link from the block edit_form.php
* new edit_form.php for the block replacing config_istance.php.
* A lot of stuff to do with UI specific to this block has been removed from rsslib.php
samhemelryk