Git commits in Moodle 2.3.0 by Tomasz Muras

commit 04bfa67c4141d6e0aa7df4c3c37c56ce1a4f10bb
Author: Tomasz Muras <nexor1984@gmail.com>
Date:   Fri, 11 May 2012 14:56:01 +0800
Tag:    v2.3.0-beta

MDL-32930 Add escaping for '_' character

commit c92e462b04ec92759cc11cd7161f40cc7c2850f3
Author: Tomasz Muras <nexor1984@gmail.com>
Date:   Fri, 11 May 2012 05:35:18 +0800
Tag:    v2.3.0-beta

MDL-32930 Improve the performance of get_tables