shapeFit.forks: EXPERIMENTAL: Point cloud multiple circle fit
In TreeLS: Terrestrial Point Cloud Processing of Forest Data

Search and fit multiple 2D circles on a point cloud layer from a single tree, i.e. a forked stem segment.

shapeFit.forks(
  dlas,
  pixel_size = 0.02,
  max_d = 0.4,
  votes_percentile = 0.7,
  min_density = 0.25,
  plot = FALSE
)

`dlas`	`LAS` object.
`pixel_size`	`numeric` - pixel side length to discretize the point cloud layers while performing the Hough Transform circle search.
`max_d`	`numeric` - largest tree diameter expected in the point cloud.
`votes_percentile`	`numeric` - use only estimates with more votes than `votes_percentile`.
`min_density`	`numeric` - between 0 and 1 - minimum point density within a pixel evaluated on the Hough Transform - i.e. only dense point clousters will undergo circle search.
`plot`	`logical` - plot the results?