Nodes now remember there currency
Community creation depends on node creation

Show members in table with columns for pubkey, uid, join date and expiration
Display members who will expire in 15 days as red

When an endpoint is incorrect, let's try the next endpoint
When no peer could be joined, throw an error

We can export and import accounts

Account now has Wallets and Communities
Wallets are now managing the network side of ucoin
A community doesnt depend anymore on a wallet
A wallet knows what community it is part of thanks to currency name

Sauvegarde de fichier, utilisation de "factory" pour créer des models a partir de rien ou a partir de json.