Git commits in Moodle 3.0.4 by Eric Merrill

commit e9024a144395a0375f44816f7e4d4677a03ee505
Author: Eric Merrill <merrill@oakland.edu>
Date:   Wed, 13 Apr 2016 10:26:35 +0800
Tag:    v3.0.4

MDL-53795 logging: Add DB index for use when backing up logs

commit 17bf9bbdaf149646cdef10e066c57643a0a734b5
Author: Eric Merrill <merrill@oakland.edu>
Date:   Fri, 11 Mar 2016 05:32:02 +0800
Tag:    v3.0.4

MDL-53430 dml: Fix recordset_walk for additional parameters

commit 3ecd9378e93806d04d4561f8919cb3d5d49e91e3
Author: Eric Merrill <merrill@oakland.edu>
Date:   Fri, 12 Feb 2016 01:29:35 +0800
Tag:    v3.0.4

MDL-53176 grades: Adding index to improve history search