Version 0.1-10 (2013-04-30)
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* `VT` changing permutation formula from '>' to '>='

Version 0.1-9 (2013-01-23)
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* `my_wss_method` changing order(score) to rank(score)

Version 0.1-8 (2013-01-22)
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* `WSS.R` changing perm.pval: x.perm '>=' wss.stat
