v0.3.0.1: modify sort and uniq
v0.3.0.1: update TODO
v0.3.0.2: fix parameter expansion in __um_add()
v0.3.0.2: fix parameter expansion in __um_add()
v0.3.0.2: update conf file
v0.3.0.3: interim solution in __um_query_post() and __um_query_post_and()