This should allow us to switch page layout on admin pages and elsewhere before $OUTPUT->header() call.

MDL-28135 general Updating all hardcoded "docs.moodle.org/en/Development:" type doc links to "docs.moodle.org/dev/"

MDL-26265 use cm_info in PAGE->cm because it has more useful information; add context property to cm_info

Major tasks undertaken in this patch:
* New format_text argument, overflowdiv.
* New page layout Report.
* Review of all format_text calls.
* Added support for the report layout to all themes.
* Changed forum post display from tables to divs.

MDL-16723 automatic redirects to https when loginhttps enabled - this solves accidental usage of http version + it also solves recent navigation regressions + fixed regression from PAGE conversions + deprecated old httpsrequired() and $HTTPSPAGEREQUIRED

navigation MDL-24129 showing the hidden regions when moving blocks. This also adds the 'blocks-moving' class to the body as an indicator for themers.

MDL-23797 improved detection of PAGE->context abuse andproblems; fixed incorrect use of this->context instead of this->_context; missing PAGE->context does not throw fatal error any more

MDL-23655 fixed yet another PAGE->context issue - let's make system context default PAGE->context in CLI scripts

Course MDL-23062 turned off $doanything super admin power for a editing capability check to effect a switched to role from admin.

themes MDL-21489 Added support for a legacy theme used with old browsers. Thanks Brendan for the patch
Admin can now select a theme for modern browsers and old browsers, the user then sees the modern theme with modern browsers and legacy theme with old browsers. Currenlty IE6 (or less) are considered old browsers.

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.