Git commits in Moodle 3.6.x by Zig Tan

commit 8ea4df50c95a3355d41958d02d9cdab2844f212f
Author: Zig Tan <zig@moodle.com>
Date:   Fri, 29 Jun 2018 17:07:35 +0800
Tag:    v3.6.0-beta

MDL-61870 mod_assign: Fix/clean up imported group override duedates


commit 888d7b585f409842f692d337f103f5e173b7a7b0
Author: Zig Tan <zig@moodle.com>
Date:   Fri, 29 Jun 2018 12:25:41 +0800
Tag:    v3.6.0-beta

MDL-61052 assign: Improve strip_images() to avoid HTML5 tags errors


commit 6bcc6f877ad7deeb688c25ef4b17b19d3197882d
Author: Zig Tan <zig@moodle.com>
Date:   Fri, 29 Jun 2018 11:21:45 +0800
Tag:    v3.6.0-beta

MDL-61870 mod_assign: Fix/clean up imported group override duedates


commit bc87f6a2e356e1f4adee0697ee33121f31c21ae9
Author: Zig Tan <zig@moodle.com>
Date:   Wed, 27 Jun 2018 15:50:31 +0800
Tag:    v3.6.0-beta

MDL-44081 assign: Fix Grader annotation button accessibility ordering


commit a8f7818beb885e0febaf60759c663ba435e1376b
Author: Zig Tan <zig@moodle.com>
Date:   Wed, 27 Jun 2018 12:17:39 +0800
Tag:    v3.6.0-beta

MDL-62533 assign: Show assign hidden status on grading summary page


commit fcb7d2a976b7425eea72f7236a67ec9c49314d8c
Author: Zig Tan <zig@moodle.com>
Date:   Tue, 19 Jun 2018 13:36:24 +0800
Tag:    v3.6.0-beta

MDL-42818 assign: Add grading UI indicator about followup submission


commit 8f7d07fa7d6a171a5396fbaf69be1be38771d7f5
Author: Zig Tan <zig@moodle.com>
Date:   Mon, 18 Jun 2018 16:41:53 +0800
Tag:    v3.6.0-beta

MDL-38301 mod_assign: Fix date validation logic & message consistency


commit 8be71d396b5bd510044b2436817991b1232a5bed
Author: Zig Tan <zig@moodle.com>
Date:   Fri, 15 Jun 2018 10:10:59 +0800
Tag:    v3.6.0-beta

MDL-61482 mod_assign: Clean html in offline grading CSV


commit e689e4d446013bdbf96530ab3b17ac9dae3cc87b
Author: Zig Tan <zig@moodle.com>
Date:   Fri, 15 Jun 2018 09:46:29 +0800
Tag:    v3.6.0-beta

MDL-58702 backup: Fix restoration of role mappings labels