AHRS: rename DCM and Quaternion implementions ready for AHRS class

this is the first step to creating a general AHRS class for ArduPilot

libraries/AP_AHRS/AP_AHRS_DCM.cpp

@@ -161,7 +161,7 @@ void
 AP_DCM::matrix_reset(bool recover_eulers)
 {
 	if (_compass != NULL) {
-		_compass->null_offsets_disable();		
+		_compass->null_offsets_disable();
 	}
 
 	// reset the integration terms

libraries/AP_AHRS/AP_AHRS_DCM.h

@@ -152,6 +152,3 @@ private:
 };
 
 #endif
-
-
-

libraries/AP_AHRS/AP_AHRS_HIL.h

@@ -76,6 +76,3 @@ private:
 };
 
 #endif
-
-
-