Yarpmotorgui with displayed hardware faults messages

[randaz81]

See discussion: robotology/community#561

• Modified yarpmotorgui to support a new page "Hardware Fault" which displays the internal hardware error
• Added new interface IJointFault with method: IJointFault::getLastJointFault(int j, int& fault, std::string& message)
• IJointFault is now implemented by RemoteControlBoard and ControlBoard_nws_yarp
• fakeMotionControl.cpp now simulates an hardware fault when it receives a TorqueCommand > 1Nm

[PeterBowman]

1. I wonder if bool getLastJointFault(int j, int* fault, std::string& message) would be more consistent with existing interfaces (note the second parameter, as a primitive type, is passed as a pointer instead of by-reference).
2. Could you please also register this new interface in yarp.i? I think it just needs an %include, a CAST_POLYDRIVER_TO_INTERFACE(IJointFault) and an extension for output parameters such as this (not tested):

   %extend yarp::dev::IJointFault {
       bool getLastJointFault(int j, std::vector<int>& fault, std::vector<std::string>& message) {
           return self->getLastJointFault(j, fault[0], message[0]);
       }
   }

   (change fault[0] to &fault[0] if a pointer is passed instead of a reference)

[randaz81]

Thank you @PeterBowman
Point 1: I'm trying to use & instead of * in new interfaces. It prevents users from doing bad things, such as passing a nullptr. Of course, I cannot easily change old ones.
Point 2: done

[drdanz]

/rebase