Git commits in Moodle 2.3.8 by Michael Aherne

commit 77182cd2991fe76c40fc4ff93640b8c132d8a1d8
Author: Michael Aherne <michael.aherne@strath.ac.uk>
Date:   Fri, 21 Jun 2013 18:40:36 +0800
Tag:    v2.3.8

MDL-40275 core Improve documentation for block_base::has_config()