_compute_all skips first element when q0 not None

[Yushchuk6]

In method def _compute_all(self): of filters that have a parameter q0, computation is 1 element off.

For example, in the AQUA filter:

Q[0] = self.init_q(self.acc[0], self.mag[0]) if self.q0 is None else self.q0.copy()
for t in range(1, num_samples):  
    Q[t] = self.updateMARG(Q[t-1], self.gyr[t], self.acc[t], self.mag[t])

range(1, num_samples) can produce numbers only from 1, which is good if you are using reading [0] as your starting point.
But when q0 is set, it just skips [0] reading.

It can be very crucial if you send a small number of samples.
I'm trying to use def init() result as a real-time filter by sending only one sample + previous Q as q0 and because of this bug it returns only q0