This commit lets the "Other" talker be always shown in the top talkers
report of a web interface if its traffic value is not zero. This also
lets the "Other" talker accumulate traffic also for hosts above the
maximum number of top talkers.
This commit adds to the retrieved top talkers a final entry
grouping stats for all remaining talkers which are not included
in the top ones. This helps get a feeling of the proportion
between the traffic of the top talkers and that of other talkers.
