when "test quota on write" fails, it should notify pod owner

In catching up on a lot of discussion and updates, it seems that when the "test quota on write" fails it results in a notification to the attempting writer -- so if @kjetilk tries to write to @RubenVerborgh's INBOX and that write would exhaust quota, @kjetilk gets notified -- but @RubenVerborgh does not.

This is troublesome, as @kjetilk's best (and possibly only) way to inform @RubenVerborgh of this problem is via his inbox ... which is full. I think that this is a place where NSS might use @RubenVerborgh's email address to send such a notification without consuming further NSS-quota.

Originally posted in https://github.com/solid/node-solid-server/issues/918#issuecomment-450062727

Inizia individuando l’implementazione Node.js dell’errore "test quota on write" e il percorso di notifica, quindi leggi la discussione dell’issue 918 collegata per il contesto. Il lavoro è completo quando il proprietario del pod viene informato dell’errore di quota senza consumare quota aggiuntiva, mentre il comportamento di notifica esistente del writer rimane compreso e coperto.