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WARNING:  DEV IS CURRENTLY VERY UNSTABLE.

This is a mega-checkin of the new Roles system.   A lot of changes have
been made in core and modules.

Currently there are a lot of rough edges and known problems.  We are
working hard on these .. .the reason for getting this into HEAD at this
stage is enable us to move faster (our branch was diverging from HEAD
too much).

Please keep an eye on http://docs.moodle.org/en/Roles for current status
and information for developers on how to use the new Roles system.

Bug fix for patch related to forcing searching in course/student.(html|php) if too many users, and bump to MAX_USERS_PER_PAGE to 5000

On enrol students to a course page, force searching if too many users to display (controlled by MAX_USERS_PER_PAGE - not previously used and bumped up to 1000 as a more reasonable limit) - trying to put 30,000 users in a drop down menu crashes some browsers

Merged from MOODLE_14_STABLE

autofocusses search input