feat: added client data pointer for caller convenience
Changed from blkflg to influence flag array
Additional tweaks -- now 11 times faster than original version
Doubled calculation speed and exposed raw weight computation
Minor comment change
Added accessor functions for minimum spacing and smoothing parameters
Changed radius specification to diameter and added usage comment
Added missing #define's for C++ and duplicate headers
Added interp2_realloc() call, exposed interp2_analyze() and code improvements
Created routines for interpolating anisotropic 2-D samples
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