Ftw.datepicker

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- Move ressources to plone bundle. [busykoala]

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- Disable autocompleting and autofilling of datepicker fields. [tarnap]

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- Fix issue with language format selection for deployments
with mutliple languages AND non-combined language codes.
[lgraf]

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- Fix insert-after reference in the JS registry. [phgross]

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- Use minified version of the jquery.datetimepicker JS. [phgross]

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- Add support for combined (country specific) language codes. [mathias.leimgruber]

- Update DateTimePicker to version 2.5.18. [mathias.leimgruber]

- Add Plone 5.1 support [njohner]