plotTrajectory: Plot the exolutionary trajectory of a tumour
In morrislab/TrackSigFreq: TrackSig - cancer evolutionary trajectory estimation

For each bin in a set of signature mixtures, the mixture is plotted accross pseudo-time. Provided changepoints will be highlighted.

1	plotTrajectory(trajectory, linearX = F, anmac = F, show = F)

`trajectory`	a list containing named elements "mixtures", "changepoints", and "binData". See @seealso TrackSig.
`linearX`	logical whether to plot with a linearly spaced x-axis grid, or with binned phi values
`anmac`	logical whether to plot x-axis restricted to ccf space, or use estimated average number of mutant alleles per cell (anmac)
`show`	logical whether to print the plot as a side effect when called