Delaunay Refinement (DR):
Given a Delaunay triangulation in 2 dimensions, return a Delaunay triangulation
that includes all original points plus additional points such that no triangle
has an angle smaller than a threshold Theta.
Input and Output File Formats
Both the input and output need to be in the Triangles file format. The input
must be a valid Delaunay triangulation of its points. The output must
include all input points, plus any number of additional points, and
must be a valid Delaunay Triangulation of all its points.
Default Input Distributions
Each distribution should be run for
n=2,000,000.
For this benchmark the input triangulation is generated using a Delaunay
triangulation on various point distributions. These triangulations
are generated using the PBBS code for Delaunay triangulations, which also adds
in a small number of boundary points beyond the original input points.
The point sets are non degenerate.

(1) Points selected at random uniformly within a unit circle.
uniform s d 2 <n> <tmpname>
delaunay o <filename> <tmpname>

(1) Points selected at random from the Kuzmin distribution. This is a 2d
version of the 3d Plummer distribution with points highly concentrated around the origin,
but some points far off.
plummer d 2 <n> <tmpname>
delaunay o <filename> <tmpname>
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