Ftw.permissionmanager

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- Fix possible encoding issues while exporting the permission. [mathias.leimgruber]

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- Fix Plone 5 compatibility with search view (working modals) [Nachtalb]

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- Remove patch reindexing metadata and replace by selective locations. [busykoala]

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- Add Plone 5.1 support [tinagerber]
- Drop archetypes support [tinagerber]
- copy_permissions no longer overwrites existing permissions [tinagerber]

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- Disable the right column on sharing so it's content is not
covered by portlets in the right column. [mbaechtold]

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- Refactor reindexObjectSecurity patch to be less invasive. [jone]