Adding function duplicated2
cf. http://joseph.larmarange.net/?Rechercher-et-visualiser-les
Function na.rm  cf. http://joseph.larmarange.net/?Manipulation-de-donnees-quelques
Function rm.unused.levels cf. http://joseph.larmarange.net/?Manipulation-de-donnees-quelques
odds.ratio.multinom n'était pas correctement exportée
Odds ratios are the exponential of coefficients
calling summary only once
Need to take into account the case where main outcome has only two levels
a more explicit name
Merge pull request #32 from larmarange/issue31

Fixing several bugs in odds.ratio.multinom
Merge pull request #27 from larmarange/issue17

New functions : duplicated2, na.rm, rm.unused.levels
Update NEWS
Merge pull request #3 from juba/master

Updating from juba/master