Fix the Q point used for heading accuracy estimate.

Per the SH2 manual,
Section 6.5.18  Rotation Vector (0x05)
In addition an estimate of the heading accuracy is reported. The units for the accuracy estimate are radians. The Q point is 12.

Author: tstellanova

src/SparkFun_BNO080_Arduino_Library.cpp

@@ -372,7 +372,7 @@ float BNO080::getQuatReal()
 //Return the rotation vector accuracy
 float BNO080::getQuatRadianAccuracy()
 {
-	float quat = qToFloat(rawQuatRadianAccuracy, rotationVector_Q1);
+	float quat = qToFloat(rawQuatRadianAccuracy, rotationVectorAccuracy_Q1);
 	return (quat);
 }
 

src/SparkFun_BNO080_Arduino_Library.h

@@ -271,6 +271,7 @@ class BNO080
 	//These Q values are defined in the datasheet but can also be obtained by querying the meta data records
 	//See the read metadata example for more info
 	int16_t rotationVector_Q1 = 14;
+	int16_t rotationVectorAccuracy_Q1 = 12; //Heading accuracy estimate in radians. The Q point is 12.
 	int16_t accelerometer_Q1 = 8;
 	int16_t linear_accelerometer_Q1 = 8;
 	int16_t gyro_Q1 = 9;