uuid parser, dataset

WIP
Add a non-modeling column type, the UUID

New column type UUID.
Parse the Java fixed-format UUID.
Display in browser; export to CSV.
Remove as default-available modeling column from most algos.
Add a generic C16Chunk holding 2 longs, available as vec.at16l() and
vec.at16h() and their usual Chunk equivalents.
PrettyPrinter.uuid(lo,hi) for printing.
Fixed bugs with all the various frame splitter utilities dropping the
"time" value (thus converting a time column into an integer column).
Copy the UUID flag thru as needed.
Cleanup numerous ideaj warnings
fix UUID overrun parse bug
Bug fixes in UUID parsing

Mostly around handling non-UUIDs in attempted UUID parse.
Fix ideaj warning
Get the uuid parse test right
merge
glm1 > glm2
Merge branch 'master' of github.com:0xdata/h2o
cutout xlo as well
update perf tests to use correct col for mnist_training (1st instead of last)
row-slice with UUIDs

plus debug frame printing
runit_NOPASS_cbind.R is failing for a variety of reasons
match it to nidhi's open jira
print correctness results for debug
Merge branch 'master' of https://github.com/0xdata/h2o
fewer rows in runit_NOPASS_pub-770.R to run faster.
still fails
Merge branch 'master' of github.com:0xdata/h2o
Handle slice & copy UUID

in some limited exec functions
made it like the R 770 test
Merge branch 'master' of github.com:0xdata/h2o