Plone.formwidget.namedfile

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Bug fixes:

- Fixing UnicodeError when the z3cform_validate_field view sends
a filename with type unicode. (collective.easyform in our case)
[karalics]

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Bug fixes:

- Fix issue where display widget failed to render file fields located
on form fieldsets, because of broken generated download url
[datakurre]

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Bug fixes:

- Use zope.interface decorator.
[gforcada]

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Bug fixes:

- Make the download URL independent of the request URL. The format of the
URL will always be:
``$CONTEXT_URL/[$FORM/]++widget++$WIDGET/download[/$FILENAME]``
[rafaelbco]

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Incompatibilities:

- Removed no longer needed ``thumb_width`` and ``thumb_height`` from
the image widget. ``width`` and ``height`` are still there.
[jladage, maurits]

New:

- On the edit form, show a thumbnail instead of rendering the image in
full size. To make this prettier on retina screens, we actually
load the larger preview scale and let it use the width and height of
the thumbnail.
Fixes https://github.com/plone/plone.formwidget.namedfile/issues/21
[jladage, maurits]

- Use ``plone.app.testing`` in tests. [maurits]

-------------------

Fixes:

- Fix issue, where NamedFileWidget and NamedImageWidget on
``zope.schema.ASCII`` fields cleared the field values on resubmit
with action ``nochange``.
Fixes: plone/Products.CMFPlone1144
[thet]