Core PR # 121 : use title_item() instead of the property as it can be defined as a callback
Merge remote-tracking branch 'origin/master/chiba2' into master/dubrovka

Conflicts:
	novius-os
Core : PR # 120 Remove this useless delete method for Twinnable_ManyMany
Merge branch 'master/dubrovka' into master/elche
Core : PR # 131 from dubrovka