MDL-19039 improved default frontpage role capability evealuation, needs to be manually enabled in config.php

Prevent any roll of dates if differences are < 24h. Merged from 19_STABLE

causing restore dates to be rolled based in the course where the backupfile is stored
and not in the target course. Merged from 19_STABLE

before any further processing by restore_execute(). More coming. Merged
from 19_STABLE

quizz MDL-20421 remove php notice when Enable Safe Exam Browser integration is not activated, merged from 1.9

Only $PAGE->generaltype 'maintenance' works before the site is fully installed.
We were specifying that on all other relevant pages, but it was missed out here.

Will recommit with a good comment.

PHP Fatal error:  Can't use function return value in empty call.

MDL-16940 Applied the patch for visibility of dropdown menus in course view for IE6 when AJAX is on. Merged from MOODLE_19_STABLE

MDL-20415 Modified the behaviour of AJAX moving of sections when in "weekly" format, so that dates don't get moved along with the sections. This reflects the final, saved state. Merged from MOODLE_19_STABLE

MDL-18469 Minor changes to restore silenty/import before implementing checksum. Merged from 19_STABLE

$PAGE->set_url() is already properly called by admin_externalpage_setup()
with a required 'section' param included. We can't override the PAGE's
URL and throw away the params set previously. This may be an issue at
other external admin pages, too.

* New admin setting $CFG->allcountrycodes - on Location page.
* Same rules used to translate country names as any other string.
* With unit tests.

MDL-10221 Simulating the HTTP DELETE method by using a URL param (action), because some web servers don't allow DELETE. AJAX Course and Block deletion now works as expected. Merged from MOODLE_19_STABLE

MDL-15262 Added a two capabilities to prevent certain users from changing a course's fullname and shortname. merged from MOODLE_19_STABLE

The {blog_association} is not defined but it is still referenced in the
core functions. This seems to be some blog subsystem mess that prevents
the core from removing any activity module and the context. I am sorry
Nico if I break something in your current work...

Plain 'mod.php' does not seem to be supported at the moment as a valid $url for the Confirm button