Clarify trade condition title

Prices are defined on Supply Line inside Sale Trade Condition.

Drop prices from Subscription Condition.
Instead, link the Subscription Condition to a Sale Trade Condition.

Apply the Sale Trade Condition on the created Open Sale Order.

Stop duplicating properties from the Subscription Condition to the created Subscription Request.

Payment is managed by the 'payment' category, and not the language.

This allows to remove all '==zh' conditions.
Instead, use custom Sale Trade Condition.

slapos_accounting: rename script for hosting subscription

slapos_accounting: revert failure error

slapos_accounting: force open order line to have an Instance tree and a hosting subscription

slapos_accounting: hosting subscript will host the date info

slapos_accounting: set open order periodicity on the hosting subscription

slapos_accounting: typo

slapos_accounting: hosting subscription will contain the periodicity

slapos_accounting: create hosting subscription

slapos_accounting: fixup start/stop date confusion

slapos_accounting: fixup

slapos_cloud: add hosting subscription workflow

slapos_cloud: stop using Instance Tree as Subscription Item

slapos_accounting: move periodicity view on hosting subscription

slapos_erp5: open order line have 2 items now

slapos_cloud: open order line has 2 items now

slapos_accounting: simulation is expanded from Hosting Subscription

slapos_accounting: validate hosting subscription

slapos_accounting: check all aggregate value

slapos_accounting: revert aggregate tester

slapos_accounting: simulate from hosting subscription

slapos_accounting: constraint is on hosting subscription

slapos_accounting: interaction are on hosting subscription

slapos_subscription_request: periodicity is on hosting subscription

slapos_accounting: open order line has 2 aggregate

slapos_cloud: hosting subscription have a workflow again

slapos_cloud: add hosting subscription template

slapos_accounting: do not create open order if it was not allocated

slapos_accounting: script renamed

slapos_cloud: update HS_view

See merge request nexedi/slapos.core!498

   We can introduce style to prevent page blink blank for a moment.

See merge request nexedi/slapos.core!491

See merge request !455

See merge request nexedi/slapos.core!478

See merge request !495

This is no longer guessed on Zope4

this way we can just assert the full page content

this does not depend on the details of the URL

See merge request !493

   .. on consistency table

See merge request nexedi/slapos.core!489

See merge request !490

Adding the whole top-level available IPv6 range to the local table
conflicts with tun/tap usage. Instead, add only the IPv6 subranges
actually allocated to a partition.