fix import problem

[orekides]

the am2q function is used in the ekf.py file , but not imported
Q[0] = am2q(self.acc[0], self.mag[0]) if self.q0 is None else self.q0/np.linalg.norm(self.q0) in ekf.py line 77.

[Mayitzin]

Thanks. The import is fixed now with commit e172526 .

It will now use the new function ecompass instead of the old am2q. Eventually, am2q will be removed in favour of the new function.