CORE-5931: Added the content-range header to the response for HEAD requests in anon-files.
Fixed issues with the HEAD requests in anon-files.
Fixed Content-Length, again.
Added another RFC to the README for anon-files.
Merge branch 'dev'
CORE-5947: fix a problem with deadlocks that was occurring when multiple job updates arrived simultaneously
Merge branch '1.9.0' into dev