Permission denied when copying annotations between items

[Nicklas Nordborg]

The AnnotationSet.copyFrom() method is used to copy annotations from one item to another one. But this seems to be broken by the fix to #1685 if the logged in user doesn't have permission to all annotation types that have been used for the source item. The documentation states that the copy should work even if the user doesn't have permission to all annotation types.

Note that this is not a backdoor, since the user is still not able to actually see the copied value.

[Nicklas Nordborg]

(In [6101]) Fixes #1713: Permission denied when copying annotations between items