fix autoform_is_inlined bw compat

[forms] fix implementation of backward compat method form_render previous implemtation used form_default_renderer() which is now replaced by default_renderer()

inherit from FieldWidget to inherit from the process_field_data required by the edit controller

with cw 3.6 we've to specify entity's relation role

fix bad merge

import uicfg.auto_form doc

update i18n doc

Fix element tree import for python2.4

forgotten buffer

backport stable branch

fix pb with bytes field processing: currently when an existing file is edited and no new file is specified, it finds no value in req.form and so try to detach the current file, which is wrong. In that case, nothing should be done. So introduce a new UnmodifiedField exception that may be raised in field's process_form_value method (catched in field.process_posted).

fix NameError

don't call handle_inlined_relation where we're not on the relation'subject

don't add another _cw_edited_field hidden when build_context is called twice (may occurs with inlined relation forms)

cleanup

don't use matching_groups() for is_in_group implementation