------------------
* Allow arbitrary extra parameters for the fieldset directive. This is useful
for extensions that want to tweak fieldset behaviour or rendering.
[wichert]
* Add ``no_omit`` directive, so that fields that have been omitted can be
re-included again on for a more specific form interface.
[davisagli]
* Accept a form interface as an optional positional argument for the ``mode``
and ``omitted`` directives, and store it in the tagged values using the new
format expected by plone.autoform.
[davisagli]
* Add ``form.error_message()`` decorator for registering custom error
messages for errors and/or fields.
[optilude]
* Add ``form.validator()`` decorator to register a simple field validator.
See README.txt for details.
[optilude]
* Support unwrapped forms (in Zope 2.12). The default is to wrap in Zope <
2.12, and not to wrap in Zope >= 2.12. A new ``form.wrapped()`` directive
can be used to force wrapping or non-wrapping (by passing ``False`` as an
argument).
[optilude]
* Warn more forcefully when using form directives on interfaces not deriving
from ``Schema``, or using schema hints that refer to field names that cannot
be found.
[optilude]