Updates for Moodle v2.7.0:

- Insert GPL header per Moodle coding standards.
- Update deprecated context functions.
- Add log event class in order to replace add_to_log fn.
- Update deprecated context_instance_preload_sql().
- Update deprecated context util method.
- Update version info and declare dependency for ues.
- Update download confirmation warning to be far less LSU-specific AND to remove
a strange dependency on the LSU gradebook.
-- Solves the following warning:

Invalid get_string() identifier: 'ferpa_required' or component 'grades'. Perhaps you are missing $string['ferpa_required'] = ''; in lang/en/grades.php?

    line 293 of /lib/classes/string_manager_standard.php: call to debugging()
    line 6901 of /lib/moodlelib.php: call to core_string_manager_standard->get_string()
    line 187 of /blocks/ues_people/lib.php: call to get_string()
    line 241 of /blocks/ues_people/lib.php: call to ues_people::ferpa_control()
    line 480 of /blocks/ues_people/index.php: call to ues_people::controls()
update plugin dependency to mdl 2.5 UES, was using mdl 2.5 version #; add todo documenting the behavior of this query when users belong to more than one section of a course: 'did you forget to make the first column of you query something unique ?'
Changes for alternatename stuffs
applicable formats...plural
Ues events_trigger_legacy until we fix this
Merge pull request #13 from lsuits/events_trigger_legacy

Events trigger legacy