Version 0.10.182

+ Refactoed SafeSocket out of payments module into safe_socket module.
+ Refactored DisplayLoop and TicketReader out of payments.Reader.
+ Implemented LoginDialog and LogoffDialog (login.py).
+ payments module now implements session support
  based on contactless card with CASHIER status.
+ report.Report module has been extended with __unicode__ method required by login.Logoff.
+ gui module now handles session signals from payments module.
+ terminals module now provides methods to start and stop internal mainloop
  required by gui module.
+ db.DB free places facilities were reimplemented using LocalDB and its new gstatus table.
  Using this technique, it is now possible to execute all payments and events queries
  in a same form in both local and remote databases.