Purpose
=======
Currently the payroll doens't manage the multi company
Specification
=============
1/ Add ir.rules on hr.contract and hr.payslip to prevent users
to access a record in another company.
2/ Add ir.rules on hr.payroll.structure to prevent users to access
a record for another country.
3/ Remove company_id fields on models that doesn't require it, as
hr.salary.rule.category.
4/ Make the accounting fields on the salary rules company dependent.
5/ Specify the country on the salary structures on the
l10n_**_hr_payroll modules.
6/ Add demo data and modify the salary package tour.
7/ Make the car_atn and company_car_total_depreciated_costs fields
compute_sudo=True, as one car can be assigned on several contract,
for different companies
Closes#26866Closes#25231Closes#24683Closes#23814