上傳檔案大小

1. 管理者設定上傳最大檔案下拉選項最大只到 100M，增加 100M 以上的選項。

   [root@moodle moodle23]# diff -uwN ../moodle/lib/moodlelib.php ./lib/moodlelib.php
   --- ../moodle/lib/moodlelib.php	2012-08-10 08:05:01.000000000 +0800
   +++ ./lib/moodlelib.php	2014-07-28 10:52:56.076647352 +0800
   @@ -5909,7 +5914,7 @@
        $filesize[intval($maxsize)] = display_size($maxsize);
    
        $sizelist = array(10240, 51200, 102400, 512000, 1048576, 2097152,
   -                      5242880, 10485760, 20971520, 52428800, 104857600);
   +                      5242880, 10485760, 20971520, 52428800, 104857600,209715200,524288000); //dywang
    
        // Allow maxbytes to be selected if it falls outside the above boundaries
        if (isset($CFG->maxbytes) && !in_array(get_real_size($CFG->maxbytes), $sizelist)) {