Fix (again) bug #61
Fix (again) bug #61

The solution implemented in 5ff6e87 didn't persist the data on the
server. So we are back to using a method (RPC) here.

guiquanz/libreboard,ArthurHlt/libreboard-cf,ahmadassaf/libreboard,xsuperbug/libreboard,ArthurHlt/libreboard-cf,ncarlier/libreboard,ArthurHlt/libreboard-cf,ahmadassaf/libreboard,xsuperbug/libreboard,guiquanz/libreboard,ncarlier/libreboard,ahmadassaf/libreboard