Consider y dodging

[matiasandina]

It could be potentially useful to plot something like this:

ggplot(wombats, aes(x=frame, behaviour=behaviour, y=trial, color=wombat)) +
 geom_ethogram()

This produces the warning

In FUN(X[[i]], ...) :
  Some behaviours will be drawn with the same value for 'x' - is this a mistake?

Which is correct functioning of ggethos. However, it might be desirable to allow for dodging in the y axis.
In addition, ethograms are not properly calculated because the warning is currently isolated via an else if from the aggregating.

Potentially interesting when calling things with interaction()

ggplot(wombats, aes(x=frame, behaviour=behaviour, y=trial, color=interaction(wombat,trial))) +
    geom_ethogram()