Avod trans step size0

[tongtongcao]

Step size of the last RK step from one measurement layer to next layer is always 0.
For such RK step with step size of 0, RK calculation is taken, but scaled by 0.
Therefore, it is safe update. The update will not change results at all, but will save some running time.
For transport, percentage of saved time is about # of measurement layers / total of steps from first layer to last layer.

[raffaelladevita]

I guess probably it was working anyway because Zf-Zi was never an exact multiple of the step size but it's good to have a check on that

[baltzell]

== testing on a float is generally not what you want, but maybe it's appropriate here.

[tongtongcao]

I guess probably it was working anyway because Zf-Zi was never an exact multiple of the step size but it's good to have a check on that

Step size is 1 cm except the step reaching next measurement layer. For this step,
if(Math.signum(Z[f] - Z[i]) *(z+s)>Math.signum(Z[f] - Z[i]) *Z[f])
s=Math.signum(Z[f] - Z[i]) *Math.abs(Z[f]-z);
However, z is updated inside of loop. Even if the next measurement layer has been reached, transport will continue one more step with step size = 0.
So the update adds a condition to stop loop when next layer is reached.

[baltzell]

Is there any good reason not to accept this?