Plone.app.linkintegrity

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No significant changes.

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Bug fixes:

- Fix tests in Python 3
[pbauer]

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Bug fixes:

- Fix test to work with merged plone.login.
[jensens]

- Python 3 compatibility.
[pbauer]

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Bug fixes:

- Mark strings in delete confirmation screen translatable
[erral]

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Bug fixes:

- Optimize migration of old Archetypes references.
[davisagli]

- Prepare for Python 2 / 3 compatibility.
[ale-rt, pbauer]

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New features:

- Prevent linkintegrity-handler from doing anything when it is switched of in the registry.
This change also prevents some issues in migration from AT to DX since linkintegrity is disabled during the migration.
[pbauer]

Bug fixes:

- Fix a missing tal condition in `delete_confirmation_info.pt` that caused a
paragraph to be always visible, even without link breaches.
[arsenico13]

- Fix view updateLinkIntegrityInformation after Language='all' no longer works.
[pbauer]