Ensure sorter index is removed
Fix #1538 : Email are not sent anymore
Fix #1550 : Remove feed entry items that are not related to a record
Merge pull request #724 from nlegoff/remove_index_sorter

[3.8] Ensure sorter index is removed
Merge pull request #722 from romainneutron/fix-1538

[3.8] Fix #1538 : Email are not sent anymore
Merge pull request #715 from romainneutron/fix-1550

[3.8] Fix #1550 : Remove feed entry items that are not related to a record
Sanitize XML data
Registe plugin_asset twig function
Merge pull request #725 from romainneutron/fix-1545

[3.8] Sanitize XML data
Merge pull request #719 from nlegoff/fix_asset_plugin

[3.8] Register plugin_asset twig function
Use Twig 1.13, waiting for bug #1251 to be solved
Merge branch '3.8'

Conflicts:
	composer.lock
	lib/Alchemy/Phrasea/Application.php
	lib/classes/Feed/Entry/Item.php
	tests/classes/Feed/Entry/Feed_Entry_ItemTest.php