added logout link

appears on every page with a sidebar when logged in
contains unread messages, pending friends, groups invited to, groups owned, views tagged with 'profile'

Moodle's XMLRPC API currently makes some calls that Mahara doesn't implement. Implement these calls as no-ops.

Moodle uses it only in the course listing block, to say '4 courses from [othermoodle]'. Mahara doesn't have any courses.

changed group/view.php to use this function to build the interaction sideblock
added the interaction sideblock to other interaction pages

Now the city, country, introduction, language and WYSIWYG editor data are also imported.

Users who do SSO with no parent authority cannot change their password. The form elements to change their password were hidden, but the validate and submit callbacks were not changed to deal with this case, resulting in the settings form crashing on save.

Change paths that were referring to view/view.php?id=..&artefact=.. to instead point to view/artefact.php?artefact=..&view=..

This is related to the viewartefactsplit branch. Now the existing code actually uses the new artefact.php script.

Added a note about a comment that has suffered some rot and seems to be overestimating what the method it is for can actually do.

Conflicts:

	htdocs/view/view.php

Conflicts:

	htdocs/admin/users/admins.php
	htdocs/admin/users/notifications.php
	htdocs/group/create.php
	htdocs/group/edit.php
	htdocs/lang/en.utf8/activity.php
	htdocs/lib/activity.php
	htdocs/lib/db/upgrade.php
	htdocs/lib/form/elements/userlist.php
	htdocs/lib/group.php
	htdocs/lib/version.php
	htdocs/search/internal/lib.php
	htdocs/theme/default/templates/form/userlist.tpl

Conflicts:

	htdocs/lang/en.utf8/mahara.php
	htdocs/lib/activity.php
	htdocs/lib/db/upgrade.php
	htdocs/lib/version.php
	htdocs/theme/default/templates/form/userlist.tpl