- Removed (closing) PHP tag ?> at the end of files [moodle.org].
- Making explicit the GPL license in php files [moodle.org].
- Changed PARAM_TEXT for in actions vars to PARAM_ALPHANUMEXT
[moodle.org].
- Changed classes in PHP files to frankenstyle prefix (utils, language
and log) [moodle.org].
- Removed $CFG->prefix in SQL queries [moodle.org].
- Removed backticks in MySQL queries [moodle.org].
- Changed the use if $_GET, $_POST or $_SESSION to required_param() or
opitional_param() [moodle.org].
- Fix some tags to english in lang/en/ file [moodle.org].