from some other X secs.
In #27338 it was implemented to do not include relays in the
bandwidth files that does not have at least 2 measurements that
are X secs away from each other.
It was implemented removing any results that were not X secs away
from each other, when all the results should be keep when there is
at least one away from the others, as commented in #28061.

when the arg is provided.
Also, use list when filtering the results and add debugging lines

has been removed. Also add logging

and do not use classmethod for it, since it is only a comparison

when creating a bw file from results

* to have at least min num results
* to have results that are more recent that x secs
* to have results that are away from each other x secs

that are away from each other a min num of secs and have at least
x results

useful to combine data when plotting

also:
* fix missing avg bw after moving functions to methods
* add more attrs to V3BWLine that are going to be used by other
  scaling methods

instead of conf and args, so that it's easier to test the method
without creating ConfigParser and ArgumentParser objects.