[IMP] account: compute_all rounding
[IMP] account: compute_all rounding

In some specific cases,it is necessary to call the `compute_all` method
and prevent any rounding to be done. This adds some flexibility in the
method to override rounding thanks to a 'round' context key.

Related to #13452 and commit 2e4777bb3288b

opw-688399

microcom/odoo,microcom/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,dfang/odoo,laslabs/odoo,dfang/odoo,microcom/odoo,laslabs/odoo,hip-odoo/odoo,dfang/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,storm-computers/odoo,ygol/odoo,ygol/odoo,laslabs/odoo,hip-odoo/odoo,storm-computers/odoo,bplancher/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,dfang/odoo,bplancher/odoo,bplancher/odoo,ygol/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,dfang/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,laslabs/odoo,ygol/odoo,storm-computers/odoo,dfang/odoo,bplancher/odoo,laslabs/odoo,laslabs/odoo,ygol/odoo,microcom/odoo,storm-computers/odoo,ygol/odoo,microcom/odoo,storm-computers/odoo,hip-odoo/odoo,ygol/odoo,bplancher/odoo,microcom/odoo,Elico-Corp/odoo_OCB