Fix interpolation domain in FrequencySeries.interpolate()
Created by: alurban
This PR fixes a bug in FrequencySeries.interpolate()
so that the output of that method is interpolated properly only over the domain of the input. As a consequence, the left
and right
arguments have been removed, since they are redundant.
A more complete unit test for FrequencySeries.interpolate()
is also added.
This fixes #932 (closed). (Note, the first attempt at doing this was in #940.)