expiration
Previously, we do
{expiration,use,removal,alert}_date = receipt_date + {expiration,use,removal,alert}_time
After this commit, expiration date remains unchange, for the other 3
dates, we calculate them by
{use,removal,alert}_date = expiration_date - {use,removal,alert}_time
Task-2657043
closes odoo/odoo#86760
Related: odoo/enterprise#25419
Signed-off-by: Steve Van Essche <svs@odoo.com>