Also document method a bit.

Instead of doing analysis of passed dict, just accept payzen_dict, which will
be blindly applied.

Split to more methods, in order to have proper separation and being able to
test critical parts.

How data will be corelated with service shall be implemented on caller level.
Thanks to this no additional requirements are added.

Allow to pass page_template which will be run in context of temporary object
with all required parameters.

Delegate responsiblity of dynamic data preparation to caller, check only service
consistency.

This reverts commit a91456c9.

Conflicts:

	bt5/erp5_payzen_secure_payment/bt/revision

This reverts commit e5b9bfac.

This reverts commit e1356f85.

It is required to give maximum extensibility to web site developer of payzen
based shop.

And so depends on erp5_tiosafe_core Business Template.

Those are all found properties which seems to be "static" for one payment
service.

Follows:
  * http://www.payzen.eu/integration/document/2.2Guide_d_implementation_formulaire_paiement_V2-1-ENG-Payzen.pdf
  * http://www.payzen.eu/integration/document/Guide_technique_d_implementation_standardWebservices_Payzen_ENG.pdf
  * http://www.payzen.eu/integration/document/2.2_Guide_d_implementation_formulaire_Paiement_V2_Parametrage_Avance_Payzen_ENG.pdf

In case of reused properties use their original name.

In case of payzen properties, use thier full name with payzen_ prefix.

This fix issues when we transfer characters not allowed in xml

This is ERP5SecurePayment service which aims to provide payzen.eu integration
following ERP5SecurePayment interface.

It allows to provide various secure payment services into ERP5.

aggregate link to a Payment Transaction Group should b reset on the child accounting lines when a Payment Transaction is cloned.

Never set value when rendering! If you do, then every time writing occur and it creates conflict error which kill ERP5 scalability! To get acquisition, you just have to call __of__. Also frequent writing make data.fs very huge so quickly.