Display a notice about going to restore a newer backup file.

Bug 1675
(http://moodle.org/bugs/bug.php?op=show&bugid=1675)

backup/restore_precheck.html

@@ -109,6 +109,16 @@
     echo "</tr></td>";
     echo "</table>";
 
+    //We compare Moodle's versions
+    if ($CFG->version < $info->backup_moodle_version && $status) {
+        $message->serverversion = $CFG->version;
+        $message->serverrelease = $CFG->release;
+        $message->backupversion = $info->backup_moodle_version;
+        $message->backuprelease = $info->backup_moodle_release;
+        print_simple_box(get_string('noticenewerbackup','',$message), "center", "70%", "$THEME->cellheading2", "20", "noticebox");
+
+    }
+
     //Now we print in other table, the backup and the course it contains info
     if ($info and $course_header and $status) {
         //First, the course info

lang/en/moodle.php

@@ -692,6 +692,7 @@
 $string['notenrolled'] = '$a is not enrolled in this course.';
 $string['noteuserschangednonetocourse'] = 'Note: course users need to be restored when restoring user data. This setting has been changed for you.';
 $string['nothingnew'] = 'Nothing new since your last login';
+$string['noticenewerbackup'] = 'This backup file has been created with Moodle $a->backuprelease ($a->backupversion) and it\'s newer than your currently installed Moodle $a->serverrelease ($a->serverversion). This could cause some inconsistencies because backwards compatibility of backup files cannot be guarantied.';
 $string['notincluded'] = 'Not included';
 $string['notingroup'] = 'Sorry, but you need to be part of a group to see this activity.';
 $string['nousersmatching'] = 'No users matching \'$a\' were found';