test/unionfind_test.cc
2008-07-13 Apply unify-sources.sh to the source tree
2008-06-15 Improve and redesign test programs + unify their output (ticket #25)
2008-03-20 Get rid of StdMap in unionfind_test.cc
2008-02-29 Port kruskal() and UnionFind from svn -r3468