Add separator lines that indicate silence

[whoeverest]

When there is a pause in the conversation for configurable t = 5 minutes, add a separator line to the table.

[gdamjan]

lines are an element already used for separating dates. how about some other visual cue? color of the timestamp perhaps?

[whoeverest]

Or maybe just adding an empty line. I think coloring of the timestamps is a bad idea, since a) it's not as intuitive as whitespace (or light-gray lines) and b) it would be distracting the eye from the colored nicks.