Ftw.file

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- Fix setting document_date if created without form. [mathias.leimgruber]

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- Support HEAD request for /plone/folder/file.pdf/download/file/file.pdf [mathias.leimgruber]

- Support HEAD request for /plone/folder/file.pdf/"view | download" [mathias.leimgruber]

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- Feature: Restrict mimetypes allowed to use with ftw.file.File. [mathias.leimgruber]

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- Fix comma in filename generates corrupt content-disposition
(correctly implement rfc6266) [Nachtalb]

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- Fix scale generation of DX Images in TinyMCE [Nachtalb]

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- Add missing documentDate indexer for dexterity file [Nachtalb]
Reindexing has to be done manually if necessary for your installation.