Nodes now remember there currency
Community creation depends on node creation

Fixed a bug in broadcast
Fixed a bug in jsonification

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

- Managing lost communities (when no nodes could be joined)
- Fixing broadcast management

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

Added threading of account loading and blockchain watching so that the UI doesn't freeze anymore