Git commits in Moodle 2.2.6 by Tomasz Muras

commit 237897b9681e1d0a24b9a43837f92f479c08e659
Author: Tomasz Muras <nexor1984@gmail.com>
Date:   Mon, 24 Sep 2012 01:25:30 +0800
Tag:    v2.2.6

MDL-35547 Fetch more sub-categories with one SQL query.

commit 8c39dfb9ba5e4344f6176f2a979527aee6c03072
Author: Tomasz Muras <nexor1984@gmail.com>
Date:   Sat, 22 Sep 2012 04:01:06 +0800
Tag:    v2.2.6

MDL-35547 Detect loops in question categories.

commit 54e95b2d334851183f342da254275078d9ecb43a
Author: Tomasz Muras <nexor1984@gmail.com>
Date:   Thu, 20 Sep 2012 23:48:14 +0800
Tag:    v2.2.6

MDL-35547 Detect question category pointing to itself as a parent.