2017 07-24 
    * updated runit.partiallymatched.R due to continuity correction
    implemenation changes

2017 07-24 
    * fixed a bug related to continuity correction in pm.wilcox.test related
    to U.mw, U.p, U.3 and U.4

2018 09-19
    * add two new tests MW-MW_2 and SR-MW_2
    * add choose.test to help practitioners choose best methods
    
2019-09-10
    * Modify pm.wilcox.test to handle the scenarios when there are no paired data or when there is only one pair of matched data

2019-12-10
    * Remove PKG_*FLAGS from Makefiles.win