Plone.formwidget.namedfile

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* Make the widget more robust to validation errors elsewhere in the form.
Fixes http://code.google.com/p/dexterity/issues/detail?id=76.
[optilude]

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* Add option to remove files or images. This fixes dexterity issue 71:
http://code.google.com/p/dexterity/issues/detail?id=71
[wichert]

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* Initial release