plot.cloud.of.cells: Plot a cloud of cells
In hdng/clonevol: Clonal ordering and visualization

Plot a cloud of cells

## S3 method for class 'cloud.of.cells'
plot(cells, title = "", alpha = 1, frame = FALSE,
  cell.border.color = "black", cell.border.size = 0.1,
  clone.grouping = "random", limits = c(-50, 50))

`cells:`	cell cloud as returned from generate.cloud.of.cells
`frame:`	draw a frame surrounding the cloud of cells
`cell.border.color:`	color of the border of the circles used to draw a cell (default = black)
`cell.border.size:`	line size of the cell border, the smaller the figure size is, the smaller this value needs to be (default = 0.1)
`clone.grouping:`	how the cells of the same clone being grouped values are c("random", "horizontal", "vertical"), default="random"