Codes for interpolating from irregular grids to regular grids. For these codes we use "trigulations" which are datasets that contain connections of points in other datasets. These are rank 2 datasets tri[n,3] where the 3 points are indeces of other datasets. Triangulations are generalized, where the typical case is a set of 3-node triangles. However, 2-point "triangles" can be used for linear interpolation, 4-point squares can be used for bilinear interpolation, and 4-points for 3-D triangle interpolation. DO NOT USE THIS CLASS, IT IS STILL UNDER DEVELOPMENT! This is barely tested for the nfree=1-D case!