Merge branch 'm35_MDL-59596_DDL_Issues_With_MariaDB_10p2_SQLMode' of https://github.com/scara/moodle

David Balch authored May 28, 2018 and Mark Nelson committed May 28, 2018

In the specification, tool_consumer_instance_guid is only listed
as recommended. However, the library was requiring it.

https://www.imsglobal.org/specs/ltiv2p0/implementation-guide#toc-42

do not override session->wantsurl
do not redirect guests to user.php, they get an error there

The deleted flag was introduced through the Privacy API and was used
for post selection for the rss feed. In there it was used in the
wrong way, which lead to the exclusion of all non deleted posts instead
of excluding all deleted ones.
This commit fixes this problem.

This commit moves the availability info on top.