Git commits in Moodle 3.3.x by Martin Gauk

commit 577410806ca6458be38e78627326807524029ec4
Author: Martin Gauk <gauk@math.tu-berlin.de>
Date:   Fri, 23 Mar 2018 17:08:39 +0800
Tag:    v3.3.6

MDL-61733 atto_table: fix creating new table


commit 8abec10d55c5f57d55917a51d7f8e86855832b61
Author: Martin Gauk <gauk@math.tu-berlin.de>
Date:   Mon, 13 Mar 2017 20:49:14 +0800
Tag:    v3.3.0-beta

MDL-58244 shibboleth: handle users who are logged out