When there are too many (millions) of POS order lines associated to
opened POS sessions we get too many taxes, most are duplicated. This
causes a MemorryError.

Example queries from a real DB:
```
> select count(distinct r.account_tax_id) from pos_order_line l join pos_order o on o.id = l.order_id join pos_session s on s.id = o.session_id join account_tax_pos_order_line_rel r on r.pos_order_
 line_id = l.id where s.state != 'closed'
+-------+
| count |
|-------|
| 24    |
+-------+
> select count(r.account_tax_id) from pos_order_line l join pos_order o on o.id = l.order_id join pos_session s on s.id = o.session_id join account_tax_pos_order_line_rel r on r.pos_order_line_id =
  l.id where s.state != 'closed'
+---------+
| count   |
|---------|
| 2504539 |
+---------+
```

opw-3295467

closes odoo/odoo#124180

X-original-commit: 45d19b265033aa626e110e51d8b1d01408717a3e
Signed-off-by: Christophe Simonis (chs) <chs@odoo.com>

This commit fixes all issues detected by the new pylint
gettext-variable test.
It converts some calls to the new syntax
  _("Foo %s", bar)

to progressively migrate the code to the new syntax.

A few calls were not technically incorrect but still detected by the
linter.

  _("Foo" +
    "Bar")

has been converted to

  _("Foo"
    "Bar")

as it has the same effect and make sure the argument is of type
asteroid.Const instead of BinOp).

closes odoo/odoo#53683

Related: odoo/enterprise#11467
Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

Since implementation of repartition lines on tax in accounting, the
amount on the tax is not always the effective amount to apply on price
of a product. You can have a tax with amount of 20% for example, and two
repartition lines of 100% and -100%, that will lead to have to apply 0%
on the tax.

So we are computing the effective amount on the tax by multiplying the
amount of tax by the sum of repartition lines factor.

closes odoo/odoo#36140

Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>

Multi is the default api for methods, it is not necessary to explicitly
decorate methods with it, adds clutter and most people use it because
they see that the rest of the code uses it.

Done with `find . -type f -name '*.py' | xargs sed -i '/@api.multi/d'`

Prevent the modification of a tax which is used in an opened POS
session. This avoids inconsistency between the payment and the order
accounting entries.

opw-1859092