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* Overhaul Kuang et al. 2014 method to work with plev-lat center check rather than lat-long jet center check.
* Use maximum filter from scipy ndimage for diagonal check from 'find_local_maxima_in_2d_dataarray_with_diagonals' used in M11 and K14
* Also makes a change to Manney et al. 2011 method if using diagonal check (should not affect results as it was working before)