skewness.m: Update cset 3ef7d28833f3 to Octave coding conventions. * scripts/statistics/base/skewness.m: Use @group for multi-line examples in docstring. Use Matlab-compatible definition of bias correction factor which is "sqrt (N*(N-1))/(N-2)". Also accept logical vectors. Use parentheses around conditions in if statements. Use '!' instead of '~' for logical negation. Use in-place operators for efficiency. Use 'NaN' instead of 'nan'. Use eps instead of hardcoded tolerance. Look for error messages in %!error blocks.

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