Changes in 0.x releases of irr:
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 0.61: - Calls to deprecated functions were removed
 0.6:  - Corrected computation of the large sample standard error of the
         weighted kappa coefficient for two raters and the Fleiss' Kappa for
         m raters.
         (Thanks to Tatsuo Kagimura for this hint)
       - Corrected output and documentation of the intraclass correlation 
         coefficient's (ICC) estimate of average score ICCs.
         (Thanks to Jonathan Williams for raising this issue)
       - New functions: agree (computation of simple and extended percentage 
         agreement among several raters), maxwell (Maxwell's RE-coefficient
         for binary scales), iota (interrater agreement for multivariate
         observations)
