Fix EZP-19650: move to trash and trashpurge.php can hit the memory limit
Update kernel/classes/ezcontentobjecttreenode.php

eZContentObjectTreeNode::getLimitationList() does not need to know the user permissions when policy limitations are disabled, so don't check it.  This enables using methods like eZContentObjectTreeNode::subTreeByNodeID() to be used in SSO handler functions without an infinite loop.
Implemented EZP-20288: As a support engineer I would like eZDB & eZFS2 Cluster removed in favor of eZDFS
Fixed EZP-14361: Image / File is lost if draft saving fails
Removed: op_code handling for relations
Fixed: version no 1 not recognized as draft
Described removed feature
dbupdate: added queries to cleanup ezcontentboject_link table
Added: ezcontentobject_link cleanup queries for MySQL
Removed: ezcontentobject_link.op_code column
Added: issue number to removed feature description
Removed: dead ezcontentobject_link.op_code usage
Merge pull request #529 from pspanja/EZP-20239

Remove extraneous op_code handling for relations
Implemented EZP-20426 - Legacy cronjobs and scripts should be launchable from Symfony CLI

Refactoring of eZScript allowing to update settings while recalling the singleton.
Merge pull request #558 from ezsystems/legacy_scripts

EZP-20426 - Legacy cronjobs and scripts should be launchable from Symfony CLI
Fix EZP-20355: Insert table row in ezoe with embed elements
Merge pull request #561 from ezsystems/ezp-20355_ezoe_embed_new_table_row

Fix EZP-20355: Insert table row in ezoe with embed elements
Merge pull request #553 from patrickallaert/EZP-14361

Fixed EZP-14361: Image / File is lost if draft saving fails
Merge branch 'EZP-20288'

Conflicts:
	doc/bc/5.1/changes-5.1.txt
	kernel/classes/clusterfilehandlers/dbbackends/mysqli.php
	kernel/classes/clusterfilehandlers/ezdbfilehandler.php
	kernel/clustering/dbmysqli.php
	kernel/private/classes/clusterfilehandlers/ezfs2filehandler.php
	tests/tests/kernel/classes/clusterfilehandlers/ezdbclusterstalecache_test.php
	tests/tests/kernel/classes/clusterfilehandlers/ezdbfilehandler_test.php
	tests/tests/kernel/classes/clusterfilehandlers/ezfs2clusterstalecache_test.php
	tests/tests/kernel/classes/clusterfilehandlers/ezfs2filehandler_test.php
Removed: config leftover