update copyright and add a new property : preferred_payroll_resource_use_category usefull do defined wich services ares used in payroll.
(in this way it's possible to set a filter in payroll and display only services we need in payroll)
remove old property preferred_payroll_service_variation_base_category wich is useless now : service variation can be defined in PDM System preferences


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@27488 20353a03-c40f-0410-a6d1-a30d3c3de9de