enrich entities layout to display other relations that just the main one

[maxlath]

• all entities: add entities that link to them as wdt:P921
• authors: add prefaces and postfaces, influence networks
• works: add works based on it
• editions: add editions from works of the same author published by the same publisher
• subjects: check genre and movements, and those kind of claims(?)

[jum-s]

• publishers: add publisher's articles