Internal functions

A very simply set set of points to test the tripack functions, taken
from the FORTRAN original. `tritest2`

is a slight modification by
adding `runif(,-0.1,0.1)`

random numbers to the coordinates.

R. J. Renka (1996). Algorithm 751: TRIPACK: a constrained
two-dimensional Delaunay triangulation package.
ACM Transactions on Mathematical Software.
**22**, 1-8.

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