mstats : kendall_tau : fixed a pb when n=2          theil_slopes: return a (4,) tuple instead of a (3,(),) tuple
mstats : kendall_tau : fixed a pb when n=2
         theil_slopes: return a (4,) tuple instead of a (3,(),) tuple

git-svn-id: 003f22d385e25de9cff933a5ea4efd77cb5e7b28@4237 d6536bca-fef9-0310-8506-e4c0a848fbcf

lesserwhirls/scipy-cwt,jasonmccampbell/scipy-refactor,jasonmccampbell/scipy-refactor,lesserwhirls/scipy-cwt,scipy/scipy-svn,scipy/scipy-svn,scipy/scipy-svn,scipy/scipy-svn,lesserwhirls/scipy-cwt,jasonmccampbell/scipy-refactor,jasonmccampbell/scipy-refactor,lesserwhirls/scipy-cwt