v0.4.3

Added

• Implement interpn_alloc function for each method, which allocates a Vec for the output
• Add test of linear methods using hat function to check grid cell alignment

Changed

• Use recursive method to evaluate multilinear interpolation instead of hypercube method
  • This makes extrapolation cost consistent with interpolation cost, and reduces nominal perf scaling
  • Shows about 2x slower perf in micro-benchmarks, but about 2x faster in end-to-end benchmarks after the Python bindings
    • Need to improve benchmarking strategy to better capture perf in real-life usage
• Reduce repeated documentation
• Remove some inlining annotations and all instances of #[inline(always)]
  • Minimal effect on performance; provides more flexibility to downstream applications, especially opt-level=s builds