Developer credits
Git commits in Moodle 2.8.8 by Dave Cooper
commit 0bd275a9e20fd5bb7ce1e10e766533087a9d6701 Author: Dave Cooper <dave@moodle.com> Date: Thu, 11 Jun 2015 16:26:15 +0800 Tag: v2.8.8 MDL-50062 gradebook: Fixed behaviour when changing aggregation mathods.