Add release notes for ejabberd 2.1.6

doc/release_notes_2.1.6.txt

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+
+                              Release Notes
+                             ejabberd 2.1.6
+
+  ejabberd 2.1.6 is the sixth release in ejabberd 2.1.x branch,
+  and includes a lot of bugfixes and improvements.
+
+  Read more details about the changes in:
+    http://redir.process-one.net/ejabberd-2.1.6
+
+  Download the source code and installers from:
+    http://www.process-one.net/en/ejabberd/
+
+
+  Some of the changes are:
+
+* Account register
+- mod_register: New ip_access option restricts which IPs can register (EJAB-915)
+- mod_register: Default configuration allows registrations only from localhost
+- mod_register: New password_strength for entropy check (EJAB-1326)
+- mod_register: New captcha_protected option to require CAPTCHA (EJAB-1262)
+- mod_register_web: New module, with CAPTCHA support (EJAB-471)
+
+* BOSH
+- Don't loop when there is nothing after a stream start (EJAB-1358)
+- Fix http-bind supervisor to support multiple vhosts (EJAB-1321)
+- Support to restart http-bind (EJAB-1318)
+- Support for X-Forwarded-For HTTP header (EJAB-1356)
+
+* Erlang/OTP compatibility
+- R11: Fix detection of Erlang R11 and older (EJAB-1287)
+- R12B5: Fix compatibility in ejabberd_http_bind.erl (EJAB-1343)
+- R14A: Make xml.c correctly compile (EJAB-1288)
+- R14A, R14B: Disapprove the use of R14A and R14B due to the rwlock bug
+- R14B: Use pg2 from this version in systems with older ones (EJAB-1349)
+
+* Listeners
+- Bind listener ports early and start accepting connections later
+- Fix a leak of ejabberd_receiver processes
+- Speed up ejabberd_s2s:is_service/2, allow_host/2 (EJAB-1319)
+- S2S: New option to require encryption (EJAB-495)
+- S2S: New option to reject connection if untrusted certificate (EJAB-464)
+- S2S: Include From attribute in the stream header of outgoing S2S connections
+- S2S: Fix domain_certfile tlsopts modifications for S2S connections (EJAB-1086)
+
+* Pubsub/PEP/Caps
+- Fix pubsub cross domain eventing (EJAB-1340)
+- Use one_queue IQ discipline by default
+- Implement lifetime for broken hashes
+- New CAPS processing
+
+* ODBC
+- Increase maximum restart strategy to handle some SQL timeouts
+- Support PostgreSQL 9.0 (EJAB-1359)
+- Use MEDIUMTEXT type for vcard avatars in MySQL schema (EJAB-1252)
+
+* Miscellanea:
+- mod_shared_roster_ldap: New Shared Roster Groups using LDAP information
+- mod_privacy: Fix to allow block by group and subscription again
+- Support timezone West of UTC (EJAB-1301)
+- Support to change loglevel per module at runtime (EJAB-225)
+
+
+  Bug reports
+
+  You can officially report bugs on ProcessOne support site:
+  http://support.process-one.net/