refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Details:
* new .typed_value / .display_value on fields
* droped form_field_value on form
* .value attribute of field instead of .initial
* nicer field's __init__, allowing to give a lambda as value's value
# server debugging flag
"""
:organization: Logilab
:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
DEBUG = False
# sqlite'stored procedures have to be registered at connexion opening time
SQL_CONNECT_HOOKS = {}
# add to this set relations which should have their add security checking done
# *BEFORE* adding the actual relation (done after by default)
BEFORE_ADD_RELATIONS = set(('owned_by',))
# add to this set relations which should have their add security checking done
# *at COMMIT TIME* (done after by default)
ON_COMMIT_ADD_RELATIONS = set(())
# available sources registry
SOURCE_TYPES = {}