Clones view helpers as well when using the "clone" operator
Fixes rebate in percent calculation
Adds missing JOIN dependency in customer list manager
Implements missing verification date column in customer table

Conflicts:

	lib/mshoplib/config/common/mshop/customer/manager/default.php
	lib/mshoplib/setup/default/schema/mysql/customer.sql
	lib/mshoplib/src/MShop/Customer/Manager/Default.php