Signing on the way. There is a bug becuse of ucoin API using keyword "self", and it's conflicting with python self keyword.

Wallet content now show available sources, while Transactions sent and received will display latest transactions sent and received

Wont run because we have to port Pynacl code to libnacl

todo: implement signature function

We can export and import accounts

Configuring account reworking
Some bugs fixed

Refactoring
Debugging

Configuring account : changing its name and the communities

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