Git commits in Moodle 2.3.8 by Ruslan Kabalin

commit d71021f6011f88d1f187608b40633ea016f455fa
Author: Ruslan Kabalin <r.kabalin@lancaster.ac.uk>
Date:   Mon, 17 Jun 2013 17:19:45 +0800
Tag:    v2.3.8

MDL-33546: course: Fix current week hightlighting after dragging the section

commit 78fa55b23efecf202bd6036007698c7545348b51
Author: Ruslan Kabalin <r.kabalin@lancaster.ac.uk>
Date:   Mon, 20 May 2013 21:08:34 +0800
Tag:    v2.3.8

MDL-39760: mod_assign: Add few more callback methods.

commit 7aec80dd9e3897fffc371773ee2fbd8fb2bf76df
Author: Ruslan Kabalin <r.kabalin@lancaster.ac.uk>
Date:   Fri, 17 May 2013 22:47:50 +0800
Tag:    v2.3.8

MDL-39760: mod_assign: Make submit_for_grading accept submission as parameter

commit 7e8514c5fdae40bd2f28540a72060943000f7f23
Author: Ruslan Kabalin <r.kabalin@lancaster.ac.uk>
Date:   Fri, 17 May 2013 22:47:50 +0800
Tag:    v2.3.8

MDL-39761: mod_assign: Always check submission plugin status and visibility.