Fix #1598 #1599 : Fix support for portrait videos.
Fix #1594 : Removed users are not disconnected
Bump to version 3.8.3-alpha.1
Merge pull request #818 from romainneutron/fix-1598

[3.8] Fix #1598 #1599 : Fix support for portrait videos.
Merge pull request #810 from romainneutron/fix-1594

[3.8] Fix 1594 : Removed users are not disconnected
Merge branch '3.8'

Conflicts:
	composer.json
	composer.lock
	lib/Alchemy/Phrasea/Core/Version.php
	lib/Doctrine/Repositories/SessionRepository.php
	lib/classes/User/Adapter.php
Fix previous merge