[Suggestion] Applying the neighbour parameter to the averaging function

[kevihiiin]

Description of the suggestion
In the current state, the neigh parameter in the despiking function is only used to define the numbers of points around the spikes to calculate the replacement value for the spike.

Use case/Problem
The despiking function does not work as intended on our dataset, as the spikes seem to be broader than the default window size for the smoothing function.

Suggestion
A more flexible approach would be to allow the user to specify the window size for the smoothing function.
My suggestion would be to pass the neigh parameter to the smoothing function.

I will provide a PR in a due course.