Agora: Added settings file to improve performance

Forced default timezone to Server's local time (to avoid problems with quizzes)
Core: Reduced from 4 days to 1 the waiting time to purge draft files

Added $CFG->agora_draftfilepurgeage parameter to let configure the waiting time to purge files (default Moodle value was 4 days but now it's only 1 day if $CFG->agora_draftfilepurgeage is not specified).
Core: Increased default repository timeout from 30 to 150 to let downloading bigger files
Auth IW: Added bridge file to login from Intraweb
Core: Added support for https authentication using BigIP
User bulk capitalize: Added capitalize as user bulk action and on user creation
Agora: Added config for multiinstance installation
Core: Changes made for 2.4.0 version (Split needed)
 - Protect uninstall
 - Protect Settings
 - CAS auth changes
 - LDAP auth changes
 - Config oracle and mysql
 - Control backup hours
 - Erased patch on course/lib.php
 - Mimetex for SunOS
 - And many more
Original commit: sarjona authored on 11 Dec 2012
Agora: Changed id for usu1 for training environment if is an odd hour (to regenerate site without error messages)
Agora mailer: Converted some protected properties to public to allow direct read access
Agora mailer: Added missing reply name for no reply address
Simple: Added format senzill per temes
Core: Added a restriction to avoid admin user changes its own username (admin has to be always admin!)
Core: Changes made for 2.4.3 version (Split needed)
 - Course formats
 - And some more
Original commit toniginard authored on 20 Mar 2013
Core cohort: Reviewed default enrol cohorts behaviour to let everybody with cohort:view capability enrol system cohorts
Core: Hidden Cache plugins section (only visible for xtecadmin)
Agora: Added $CFG->altcacheconfigpath to have only one cache config file for all instances (instead of having one for each site in moodledata/usuX/muc/config.php)
Agora: Hidden all themes to avoid schools to change it. Now, only xtec2 and mymobile themes are visible
Core: Blocked course restoration in rush hours
Core: To let access to langimport subpackage only to xtecadmin user