Ftw.calendar

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- Nothing changed yet.

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- Add missing Upgradestep for minification errors in fullcalendar js fix [Nachtalb]

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- Fix double minifcation errors in fullcalendar js [Nachtalb]
- Drop Plone 4.2 support [Nachtalb]
- Add missing 5.1 compatibility notice [Nachtalb]

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- Add support for Plone 5.1. [cguardia, jone]
- Remove dependency on ftw.testing[splinter] (has been dropped in ftw.testing). [lgraf]

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- Drop Plone 4.1 support.
[lknoepfel]

- Add functionality to add events by clicking on a date in the calendar.
There is no default implementation. Products have to implement it for their event types.
[lknoepfel]

- Check edit permission on event to enable drag&drop.
[lknoepfel]

- Fixed bug where date range was not applied.
[lknoepfel]

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- Fix jQuery / Diazo issue: set proper response headers. [jone]

- Added german translation for menuitem.
[lknoepfel]