Workflow cleanup: ScriptConstraint, revert all changes, was for bootstrap issues ?

Not sure if we still have bootstrap issues requiring to move ScriptConstraint to
products. So revert this change until we have proof that this is still required

product/ERP5Type/Core/ScriptConstraint.py

-##############################################################################
-#
-# Copyright (c) 2013 Nexedi SA and Contributors. All Rights Reserved.
-#                                Gabriel Monnerat <gabriel@nexedi.com>
-#
-# WARNING: This program as such is intended to be used by professional
-# programmers who take the whole responsability of assessing all potential
-# consequences resulting from its eventual inadequacies and bugs
-# End users who are looking for a ready-to-use solution with commercial
-# garantees and support are strongly adviced to contract a Free Software
-# Service Company
-#
-# This program is Free Software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
-#
-##############################################################################
-
-from Products.ERP5Type.mixin.constraint import ConstraintMixin
-
-class ScriptConstraint(ConstraintMixin):
-  """
-    This constraint call one script that should has all logic to check and
-    fix consistency
-  """
-  meta_type = 'ERP5 Script Constraint'
-  portal_type = 'Script Constraint'
-
-  def _createConsistencyMessage(self, object_relative_url, message, mapping):
-    #XXX If I put in the right place I have TypeError: 'NoneType' object is not callable
-    from Products.ERP5Type.ConsistencyMessage import ConsistencyMessage
-    return ConsistencyMessage(self,
-      object_relative_url=object_relative_url,
-      message=message,
-      mapping=mapping)
-
-  def _checkConsistency(self, obj, fixit=0, **kw):
-    """
-      Call script to [check|fix]Consistency
-    """
-    script_id = self.getScriptId()
-    if script_id is None:
-      raise RuntimeError("Script id not defined")
-    method = getattr(obj, script_id, None)
-    if method is None:
-      raise RuntimeError('Script (%s) not found %s' % (script_id, self))
-    object_relative_url = obj.getRelativeUrl()
-    createConsistencyMessage = self._createConsistencyMessage
-    message_list = []
-    for item in method(fixit=fixit, **kw):
-      if isinstance(item, (tuple, list)) and len(item) == 2:
-        message, mapping = item
-      else:
-        message = item
-        mapping = {}
-      message_list.append(createConsistencyMessage(object_relative_url, message, mapping))
-    return message_list