Log Message:
Update chat/ejabberd to 16.08.

ejabberd 16.08

MUC
- New MUC/Sub support
- Add 'allow_subscription' room configuration option for MUC/Sub

OAuth and ReST API
- Add OAUTH SQL backend
- New special scope: ejabberd:admin and ejabberd:user, to more
  easily grant group of privileges
- Add DB backend support for ejabberd_oauth
- Added ejabberdctl commands to manage OAuth tokens:
  oauth_issue_token, oauth_list_tokens, oauth_list_scopes,
  oauth_revoke_token
- Simplified OAuth form: username and password merged into JID
  field
- User configurable validity duration for tokens on OAuth token
  generation form
- Add support for sending back missing scope error to API ReST
  command calls
- Oauth: several minor fixes
- Support oauth password grant type, to generate token
  programmatically

Elixir support
- Update supported Elixir version to 1.2 and 1.3.
- Support installation of Elixir contributions with external
  module command line tool.

PubSub
- Fix use of like parameter in sql pubsub's requests
- Fix node configuration change with sql backends
- Fix send_last_items duplication with multi-plugin setup

MAM
- Always limit result set page size
- Use hooks instead of direct calls

API
- Add support for checking access rules conformance for commands
- Add support for rich error reporting for API
- Add support for sending back missing scope error to API ReST
  command calls
- Fix handling of complex values as arguments in http_api
- Improve error handling

Other improvements
- External Component Connection Hooks
- Fix compilation issues on R19
- Support for OpenSSL 1.1
- Make access rules in ejabberd_web_admin configurable
- Make modules loading in a dependent order (#1191)
- Make s2s stats commands more robust
- Preserve PID for offline sessions
- Several quoting fixes for PostgreSQL
- Switch supervised workers from temporary to transient

ejabberd 16.06

Config
- New ACL infrastructure
- Add shorter version of some common access rules definitions
- Allow @ inside acl rules user, user_glob or user_regexp to pass
  both user and server in single string
- Add acl rule access_rules_validator and shaper_rules_validator
  for use in mod_opt_type and opt_type callback functions.
- Allow using shapers defined by name like in s2s_shaper: fast
- Allow mod_opt_type and opt_type to transform values passed to
  it, and support better error reporting
- Do not call transform_terms multiple times in configuration
  processing when merging them
- Don't halt program when include_config_file is missing/can't be
  read
- Allow again multiple fqdn values in configuration

Commands
- Allow passing username and ip to ejabberd_commands, and use it
  in mod_http_api
- Fix path to epmd in ejabberdctl
- push_roster: must convert read strings to binaries
- set_presence: Fix command API
- Fix for modules_update_specs command
- Add ejabberdctl commands to manage oauth tokens.

Core
- Bounce messages sent to server JID
- Fix C2S session leak in rare cases
- Fix handling of queued stanzas on session timeout
- Give more time to stop and kill epmd
- When stopping ejabberd, stop modules after broadcasting c2s
  shutdown
- XEP-0198: Use different error message for bounces
- XEP-0198: Add 'h' attribute to element
- XEP-0198: Also count stanzas when socket is closed

Databases
- Fix pgsql compatibility on delete_old_messages command
- Handle Redis connection in a separate module
- Report in SQL when scram is enabled but the stored password
  isn't
- Update SQL escaping
- Use MEDIUMTEXT type for muc_room.opts in MySQL schema

MAM
- Send unique stanza id and archived tag also in the message
  carbons
- Fix "assume_mam_usage: if_enabled"
- Fix typo in mod_mam:select()
- Updated support of XEP-0313 from version 0.4 to 0.5.1
- Mnesia: Avoid cleanup on bag when disc_only, switch in memory
- Mnesia: Don't exceed table size limit
- Mnesia: Use transactions when writing

Client State Indication
- Fix handling of chat states
- Simplify check for carbon-copied chat states
- Simplify handling of PEP stanzas
- Pass chat states of other resources
- Unwrap carbon copies when checking for chat states
- Add queue_pep option
- Queue chat state notifications
- Move CSI queue handling code from ejabberd_c2s
- When stopping, delete only the configured hooks

Other modules
- ext_mod: Set HTTP/1.0 so Github accepts the request
- gen_mod: Compile early to remove undefined behaviour warning
- mod_http_upload: Let client retry HTTP upload on file size
  mismatch
- mod_last: Produce mod_last entry on account creation
- mod_muc_room: Notify on affiliation changes
- mod_register: Check password with jid:resourceprep when
  registering account
- mod_roster: respect roster item changes introduced with
  roster_process_item hooks upon pushing
- PubSub: Fix PubSub RSM on get_items
- PubSub: Add support for PubSub publishing options
- PEP: Fix sender in case of explicit pep subscriptions
- ejabberd_xmlrpc: Report error when conversion of argument type
  fails