cubicweb #17103999 super calls to dc_ methods fail [validation pending]

From 3.25, calling super(MyEntity, self).dc_title() no longer works and one gets AttributeError: 'super' object has no attribute 'dc_title'. This appears to be because __getattr__ proxy introduced in 8de62610cea2 does not work with super().

prioritynormal
typebug
done in3.25.3
load0.500
load left0.000
closed by#1c912b7d9503 [entities] Restore dc_ methods instead of __getattr__ proxy