Unify and drop duplicated code present on slapos_payzen and slapos_wechat.
  Update and move tests related to the change

slapos_accounting: Create Payment Transaction before redirect to handle external payment redirection

  Drop builder and alarm for update Confirmed Payment transaction
  Update Payment state gadget (JIO)
  Generate the link from the Sale Invoice Transaction rather them Payment (since they might not exist)
  crm: Update from Unpaid Payments to Unpaid Invoices
  Now we rely on lettered/non lettered invoices rather than payments.

   The usage of Entity_createPaymentTransaction is slightly faster since it is used to create the payment before the redirect.

   Since we arent creating Payments globally, call the builder to
produce a single payment would be overkill.

   isLettered is more accurated to accounting terms and easy to understand.

   The Payment Transaction should be created once the user attempt to pay, and not on every Payment Transaction.

    The implementation shouldn't rely on the existence of Payment Transaction for knowing if the Sale Invoice Transaction is payed or not.

See merge request nexedi/slapos.core!460

See merge request nexedi/slapos.core!461

See merge request nexedi/slapos.core!458

Capture either stdout, stderr or both separately using select.poll
to handle timeouts and multiplex the reads in the current thread.

In Python 3, a separate thread is not needed to log output in realtime.
See discussion in !319 for more details.

This partly reverts commit 86ce8b8e.

See merge request nexedi/slapos.core!456

   This change is required to overwrite (remove) roles from Query portal type, since by default it may contains an role from erp5_base bt5.

It is not used

It does not seem used.