interpolation: add meta index for accessing resampling plan easily
For future OpenMPization of the main processing loop, we must be able to access all arrays (kernel, index, length) based on line number as each processing thread will start wherever OpenMP decides to split the loop. - add metaindex array of triplets (length, kernel, index) - use that for the vertical plan - use the meta index for all vertical indexes in the main processing loop Hopefully, this seems to be the only required change for a future OpenMPization of the loop. Stay tuned !
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