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dirname() is a slow function compared with __DIR__ and using
'/../'.  Moodle has a large number of legacy files that are included
each time a page loads and is not able to use an autoloader as it is
functional code.  This allows those required includes to perform as
best as possible in this situation.

This reverts commit ab7632b7.

MDL-21233 moodle_url improvemewnts, code simplification, more diagnostics; fixed several regressions

MDL-21235 new link method in html_write, partinally replaces old html_link, going to add new action_link soon

MDL-21198 $OUTPUT->single_button() resurrection, hopefully much easier to use than $OUTPUT->button(); fixed some regressions and code style improvements

MDL-20790 more page layouts -see base theme for full list; also added new css body class for describing current layout; base layout is now default for beter BC; require_login() now sets 'incourse' layout automatically

MDL-20204 first batch of major theme changes, some regressions are still there, expect more changes and improvements soon; see tracker for details and list of subtasks

Moved $action argument from arg5 to arg2

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

MDL-19786 Renamed user_picture and action_icon component classes to moodle_user_picture and moodle_action_icon. Also moved around the classes in a more logical order in outputcomponents.php

The removing the rssfeed from cache is no longer relevant with simplepie,
but i'll create a bug to investigate clearning the cache.

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