Change how multiple lines are drawn.

Prepares for being able to duplicate and make new lines to add.

Rather than drawing all three (happy, relaxed, awake) lines in
one set and being able to switch them on and off, and then (as
was planned) to be able to add another set... Now you add one
line at a time, and each will (eventually) have its own filters
for place, people, etc. More flexible.