DiasporaFederation::Entities::Relayable::Parsing#from_hash

Parsed documentation:
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Does the same job as Entity.from_hash except of the following differences:
1) unknown properties from the properties_hash are stored to additional_data of the relayable instance
2) parent entity fetch is attempted
3) signatures verification is performed; property_order is used as the order in which properties are composed
to compute signatures
4) unknown properties' keys must be of String type

@see Entity.from_hash
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