Ftw.addressblock

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- Nothing changed yet.

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- Remove plone.app.referenceablebehavior in plone 5. [busykoala]

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- Add addressblock portal_type translation to plone domain. [tinagerber]

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- Check for ftw.subsite installed before using its interface. [busykoala]
- Remove obsolete addressblock.js - also from legacy bundle, since this lead
to the fact, that the mapblock.js was registered twice, which lead to the fact,
that the whole map implementation was broken. [mathias.leimgruber]

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- Fix edit permissions for addressblock [Nachtalb]
- Add zoomlevel and maplayers support for addressblocks [Nachtalb]

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- Add plone 5.1 support [busykoala]