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 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
Simplepie will try quite aggresively to autodiscover rss feeds by
default. Make this configurable when adding a feed and also store
the autodiscovered location rather than the input location.
I also removed the feed validator as this doesn't make much sense with
feed autodiscovery, and I think we can improve simplepie integration to
do this instead
In order to stop 'slow loading feeds' causing performance problems
with standard moodle pages, i've set the timeout for simplepie quite
low. When cron runs i've set this timeout high and cache duration low.
The intention is that cron does all the hard work of connecting to remote
sites and users get this fast fast fast from cache.
However, in the case of adding a feed its probably better to try and get the
feed more agressively..
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
