commander: remove counter

The counter variable in system status wasn't used anywhere.

msg/vehicle_status.msg

@@ -57,7 +57,6 @@ uint8 RC_IN_MODE_GENERATED = 2
 
 # state machine / state of vehicle.
 # Encodes the complete system state and is set by the commander app.
-uint16 counter   # incremented by the writing thread everytime new data is stored
 uint64 timestamp # in microseconds since system start, is set whenever the writing thread stores new data
 
 uint8 main_state		    	# main state machine

src/modules/commander/commander.cpp

@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2013-2015 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2013-2016 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -39,7 +39,7 @@
  * @author Petri Tanskanen	<petri.tanskanen@inf.ethz.ch>
  * @author Lorenz Meier		<lorenz@px4.io>
  * @author Thomas Gubler	<thomas@px4.io>
- * @author Julian Oes		<julian@px4.io>
+ * @author Julian Oes		<julian@oes.ch>
  * @author Anton Babushkin	<anton@px4.io>
  * @author Sander Smeets	<sander@droneslab.com>
  */
@@ -1258,7 +1258,6 @@ int commander_thread_main(int argc, char *argv[])
 	status.condition_system_prearm_error_reported = false;
 	status.condition_system_hotplug_timeout = false;
 
-	status.counter++;
 	status.timestamp = hrt_absolute_time();
 
 	status.condition_power_input_valid = true;