NEWS: Updates for v2.3.16

diff --git a/NEWS b/NEWS
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+v2.3.16 2021-08-06  Timo Sirainen <timo.sirainen@open-xchange.com>
+
+       * Any unexpected exit() will now result in a core dump. This can
+         especially help notice problems when a Lua script causes exit(0).
+       * auth-worker process is now restarted when the number of auth
+         requests reaches service auth-worker { service_count }. The default
+         is still unlimited.
+
+       + Event improvements: Added data_stack_grow event and http-client
+         category. See https://doc.dovecot.org/admin_manual/list_of_events/
+       + oauth2: Support RFC 7628 openid-configuration element. This allows
+         clients to support OAUTH2 for any server, not just a few hardcoded
+         servers like they do now. See openid_configuration_url setting in
+         dovecot-oauth2.conf.ext.
+       + mysql: Single statements are no longer enclosed with BEGIN/COMMIT.
+       + dovecot-sysreport --core supports multiple core files now and does
+         not require specifying the binary path.
+       + imapc: When imap_acl plugin is loaded and imapc_features=acl is used,
+         IMAP ACL commands are proxied to the remote server. See
+         https://doc.dovecot.org/configuration_manual/mail_location/imapc/
+       + dict-sql now supports the "UPSERT" syntax for SQLite and PostgreSQL.
+       + imap: If IMAP client disconnects during a COPY command, the copying
+         is aborted, and changes are reverted. This may help to avoid many
+         email duplicates if client disconnects during COPY and retries it
+         after reconnecting.
+       - Using attachment detection flags wrongly logged unnecessary "Failed
+         to add attachment keywords" errors. v2.3.13 regression.
+       - IMAP QRESYNC: Expunging UID 1 mail resulted in broken VANISHED
+         response, which could have confused IMAP clients. v2.3.13 regression.
+       - imap: STORE didn't send untagged replies for \Seen changes for
+         (shared) mailboxes using INDEXPVT. v2.3.10 regression.
+       - rawlog_dir setting would not log input that was pipelined after
+         authentication command.
+       - Fixed potential infinite looping with autoexpunging.
+       - Log event exporter: Truncate long fields to 1000 bytes
+       - LAYOUT=index: ACL inheritance didn't work when creating mailboxes
+       - Event filters: Unquoted '?' wildcard caused a crash at startup
+       - fs-metawrap: Fix to handling zero sized files
+       - imap-hibernate: Fixed potential crash at deinit.
+       - acl: dovecot-acl-list files were written for acl_ignore_namespaces
+       - program-client (used by Sieve extprograms, director_flush_socket)
+         may have missed status response from UNIX and network sockets,
+         resulting in unexpected failures.
+
 v2.3.15 2021-06-21  Aki Tuomi <aki.tuomi@open-xchange.com>
 
        * CVE-2021-29157: Dovecot does not correctly escape kid and azp fields in