GDPR Get and Forget

[KinanBab]

Unclear how compatible Accessor is with variable ownship / variable accessor and transitivity.

• Support multiple versions of the OwnCloud design.
• Support unsharded data having accessors
• Check that anonymization works with variable accessors and transitive accessors
• Anonymization when having shared ownership!
• Down grade rights (from ownership to accessor) if you arrive at a table as an accessor. Make sure this fix returns the file in OwnCloud GDPR Get.

[KinanBab]

Downgrade is implemented. This issue is obsolete.