Preliminary patch of https://0xdata.atlassian.net/browse/HEX-1319

The code need better handling of scoring.
Got rid of another reference to setColNames
Do not strip ice key prefixes

Otherwise all chunk keys look alike, and spill to the same file.  This
leads to a bunch of low-memory bugs, because reload from spill reloads a
random chunk.
Link GLM2 from Inspect2
Grid search tweaks
some v2 stuff
Merge branch 'master' of github.com:0xdata/h2o
Add an airlines junit test to DRF2
Merge branch 'master' of github.com:0xdata/h2o