top 3 is now trimmed

If there are fewer than three bars in a histogram, the top three prints the
correct number
replaced 1. etc with 1) etc

also moved format strings from re-typed literals to local vars
port histogram/view improved handling of <10 entries

port histogram now reports its actual size rather than the constant 10
report now labels "No Ports/Addresses" if none were recorded
port histogram is never resized larger; erase() replaces resize()
    removed no-arg port bucket constructor required by resize()
report now safely checks if any relevant buckets remain
address histogram reports correct size
histogram bars are now centered
printed byte counts lose silly .00 suffix
better ip6 labels for address histogram view

now instead of cutting the font size in half and greatly reducing readability,
overly-long ip6 addresses are mangled to the tune of XXXX:XXXX...XXXX
improved coloring for TCP ports

Added SSH and FTP to default colors
Now four additional top ports are colored; now reports without any default
colored ports aren't all gray