Update changelog
Merge remote-tracking branch 'origin/3.5' into 3.5_backported
New: Can add __PROJECT_REF__ and __TIHRPARTY_NAME__ into email topic or
content template.

Conflicts:
	ChangeLog
	htdocs/comm/propal.php
	htdocs/commande/fiche.php
	htdocs/compta/facture.php