more stuff getting testdir_0xdata_only to work
re-enable as.h2o(...) invisible factorization of factor columns
generate treeStats at the end of model building (was only triggered by web b4)
add more information to AUC reported in RF models
add "Retrying after" to the "IO error" message for easier log scraping
clean this up a little
overwrite the same file in hdfs to avoid filing it (when export files is used from h2o)
tweak some of the other tests