Ftwbook.graphicblock

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- Nothing changed yet.

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- Fix file download and possible other errors (primary field was not defined) [Nachtalb]

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- Add ftwbook.graphicblock portal_type translation to plone domain. [tinagerber]

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- Add Plone5 support. [busykoala]

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- Hide graphic blocks from navigation and from search results. [jone]

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- Drop Plone 4.1 support. [jone]
- Drop Plone 4.2 support. [jone]
- Introduce uninstall profile. [busykoala]
- Introduce upgrade steps. [busykoala]
- Reimplement Graphicblock with Dexterity [busykoala, jone].
- Requires ``ftw.book >= 4.0.0``.