Calculates the PDF of the time to hit a barrier for a particle moving with 1D 
Brownian motion with movement rate paramter exp(theta3) and drift 
speed spd towards the barrier, when the barrier is initially at a
distance k*spd away.
| 1 | dft(ft, k, spd, theta3)
 | 
| k | The hitting time if the particle did not move. | 
| spd | The speed at which the barrier drifts. | 
| theta3 | The log of the Brownian motion rate parameter. | 
| tt | The hitting time | 
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