cubicweb #1732685 Cluttered cached entity in dataimport's NoHookRQLObjectStore [resolved]

When using dataimport's NoHookObjectStore and MetaGenerator, each time an entity is created, a cached "empty" entity is used as a template. To avoid cluttering this cached template, a copy of it is made each time a new entity is created. Since copy() is used, it's only a shallow copy and cw_edited is not reset correctly and becomes shared between all created entities of a given type.

done in3.13.0
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