Retunds no siblings if no product already defined in ProductLocalization
Fixes a part of remaining bugs
Merge branch 'master' of github.com:ekylibre/ekylibre

Conflicts:
	app/controllers/backend/purchases_controller.rb
	app/views/backend/land_parcel_groups/show.html.haml
	app/views/backend/purchases/show.html.haml
Updates package list to install for Docsplit under Travis