don't overload 'mean' in exec
change kmeans to '_modelKey'
some test adjustments
PUB-880: Add JUnit test for parsing all files in smalldata.  Currently fails due to AIOOBE.
Disabled from JUnitRunner.java (build.sh), but enabled in JUnitRunnerDebug until fixed.
PUB-880: Remove files from the parsing test that are not supposed to be parsed (hive, .html, .rdata).
One could argue though that the error message should be an UnsupportedException, not some assertion error...
HEX-1832 Parse2 fix: handle empty files in multi file parse.
Added test case for multi file parse for parse 2 (we had test only for va parse). Added some empty files in the folder to make sure we handle that.
NewChunk compression fix: cancel sparse in compress if below required sparse ratio (instead of just going on with sparse representation).
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'master' into cliffc-XVA

Conflicts:
	src/main/java/water/parser/ParseDataset.java
	src/test/java/water/parser/ParseFolderTest.java
	src/test/java/water/parser/ParserTest.java
Remove some NEW VA-parse tests