Generify Atomic & TAtomic.  Selective lowering of default logging

Common high-volume tasks with very low fail rates can lower their
default logging level.
Was seeing log-files swamped with clean task reports.
Remove dead file
Enable GBM tests
Updated the guess/check parser setup routine for multi file parse to run MRTask checking setup of all files.
Merge branch 'master' of github.com:0xdata/h2o
Fix of bug in sampling.
Fix of bug in sampling.
Merge branch 'master' of github.com:0xdata/h2o
Changed Parse page to exclude nonfunctional XLSX parser type + updated guessing parser setup of multiple files.
Merge branch 'master' of github.com:0xdata/h2o
some set of accumulated little changes
Merge branch 'master' of github.com:0xdata/h2o
Added update of the parser setup guessing to be able to pick up on header files automatically.
Merge branch 'master' of github.com:0xdata/h2o
simplify to one file case
Merge branch 'master' of github.com:0xdata/h2o
Some GBM prep work

New test case of a bad dataset to predict with.
Cleanup test harness to more easily call GBM on new datasets.
Handle dup rows that also do not predict.
Some comments & debug prints.
Merge branch 'master' of github.com:0xdata/h2o
Bugfix in guess parser setup.
Merge branch 'master' of github.com:0xdata/h2o