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The commit introduces four new constants that can be used to declare a
maturity level of Moodle core and, in the future, of extension plugins.
If the administrator is about to install or upgrade Moodle to a version
that is not considered as production-ready yet, a warning is displayed
before any change in the database.

This patch fixes incorrect password creating, updating and resetting, updating of user fields, unsupported auth plugins are correctly identified, modification of mnethostid is prevented, fixed problem with email duplicates, new password is generated for users without email, etc. It also includes coding style improvements, more inline docs, future TODOs and license information.

This is based on patch by Jonathan Harker.

output MDL-25597 Added three new config settings that allow you to add additional HTML to every page.

AMOS BEGIN
 MOV [configsitepolicy,core_admin],[sitepolicy_help,core_admin]
AMOS END

webservice MDL-24541 change wsdoc.php external authentication into a normal moodle page with require_login(), no form, documentation directly related to the token and display from the user security keys page (see MDL for more information)

MDL-24432 changing the guest role explanation and renaming the text string to force new translation in all languages because the guest capabilities are completely changed in 2.0

MDL-24089 confirm upgrade of plugins + replaced continue button with 'Upgrade' - this should tell admins when is the upgrade going to really start

MDL-23719 longtimenosee finally reimplemented - it is now used in self enrol only. It should be faster, easier to configure and finally there should not be any "my users are disappearing" reports in the future

MDL-23167 Upgraded "Purge caches" to a full admin page with a confirm button, and added a link to it in the footer for developers.

MDL-22800 stats code using new enrol tables, I did not test it much because I do not have any test data :-(