[form] fix #719285, due to multiple calls to restore_previous_post, by proper refactorings * move __init__ code from FieldsForm to Form. Must behaviour here should actually be in the Form base class * avoid buggy duplicated call to restore_previous_post * move some code that was in the form renderer to the form'__init__ method (__redirectpath & __form_id hidden input handling)) * 'formvid' should now be specified on form selection, not on form rendering

.. -*- coding: utf-8 -*-
 
Dernières modifications
-----------------------

* la table des `derniers changements`_ fournit un exemple d'utilisation de RQL
  pour récupérer les derniers changements ayant eu lieu sur ce site.

.. _`derniers changements`: view?rql=Any+M%2CX+WHERE+X+modification_date+M+ORDERBY+M+DESC+LIMIT+30