Git commits in Moodle 2.6.0 by Nitzan Bar

commit fdb04f62e994a4b4a0450bab43412c610d828abf
Author: Nitzan Bar <nitzanbar@macam.ac.il>
Date:   Thu, 15 Aug 2013 21:27:01 +0800
Tag:    v2.6.0-beta

MDL-41259 when duplicate course shortname exists an exception is thrown and sync is aborted