Implement a random walk scan through noise data

[oubiwann]

Tasks:

• Implement neighbors/1 function (arg=point)
• Implement neighbors/2 function(arg1=point, arg2=degree/radius/distance)
• Randomly select one of the neighbors
• Append selection to accumulated points

For context, see:

• Support reading noise data with smooth transitions from point to point #52

Depends on:

• Add support for finite data traversals #60