Add lmoments#54
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These are linear combinations of order statistics and are analogous to conventional moments. Only the mean is necessary for higher-order L-moments to exist. For the third and fourth moments, I am adding the ratio version (divided by l2) as they are more commonly used than the raw versions.
For a few distributions, this PR adds analytical expressions. There may be more analytical expressions available than the ones listed here. For the rest, a general numerical method is added; I did not make any attempt to improve this routine for particular cases.