Funnelback patch 15.20.0.8

Description

Fixes an issue where the WebDAV endpoint would not re-prompt for HTTP Basic authentication when invalid credentials were provided, which could lead to a redirect loop in the Cyberduck WebDAV client.
Fixes an issue where the knowledge-graph.max_heap_size was not applied when updating knowledge graph.

(Windows) Stop any tuning runs that are in progress
Stop the Jetty web server
Deploy the provided files on top of an existing install.
(15.20.0.2) Run $SEARCH_HOME/bin/setup/start_funnelback_on_boot.pl - Please note that this will cause Funnelback services to be restarted.
(15.20.0.2) On unix only, run chown -R search:search $SEARCH_HOME/databases/neo4j/ $SEARCH_HOME/log/neo4j as root to fix file ownership replacing search with your funnelback user’s username if you used a different one.
(15.20.0.2) Restart the Funnelback server to ensure any prior funnelback-graph service is terminated.
Start the Jetty web server
(15.20.0.3) Perform an update of knowledge graph on any applicable collections to ensure "mention" relationships that reference themselves are removed.
(15.20.0.7) As wcag was deprecated in version 15.12 it is recommended to switch to using its replacement by editing collection.cfg to have 'wcag.check=false', remove FAChecker from 'filter.classes=' and set 'accessibility-auditor.check=true'. The wcag check may be completely removed from future versions.