Various fixes. Control Port now is working

Debug.py:
+ Implements functions to Lock and Unlock the print resource
+ Show the time in seconds

ATCommand.py
+ Fix use of debug object in constructor
+ More information in debug messages
+ More information in methods

Control.py
+ We need the socket server prevoius to AT commands. Add function to
start the socket server and function to returns the data from the port
5559

NavData.py
+ Fix error names constants. Add a list for the text messages
+ Fix use of debug object in constructor

ARDrone2:
+ Constructor needs the debug object from the main app
+ Use a task to monitor the drone state
+ Add lock/unlock in each method
+ Add try/except in each method
+ Fix EmergencyReset
+ Fix GetConfig

Test01.py
+ Test GetConfig