Ran the copyright notice corrector script so all Mahara related files are correctly licensed under the GPL3.

 * Give authentication plugins titles and descriptions, which are used by the authlist pieform element so people see an easier name
 * Add a new API method to the PluginAuth class, is_usable(). This can be used by auth plugins to check that required extensions are available. The authlist element will tell the user what they need to do to enable a plugin.

Fixes to the upgrade process so that it works in MySQL, and produces roughly the same database compared with if it's installed from 1.0.

Fixes to the upgrade so that an upgrade from a pristine 0.9 postgres to 1.0 produces the same schema as installing from 1.0.

user/view.php no longer includes invited and requested groups

removing old format_introction and changing uses to use format_text

It's not always the case that $SESSION will exist. Make sure when it doesn't the current_language() function doesn't blow up.

changed get_users_data so it preserves the order of users given

added methods common to myfriends.php and find.php for friends control and getting the data for the pages

Don't link to small profile field artefacts from my views; when they are linkable, use the artefact type as the display title rather than the artefact title