ENG-4977: calculate correct width of index for pure column index and expression index.
Add support for the alias sql function FROM_UNIXTIME
Fix for ENG-4967, small stack size is a little too small, has caused overflow in two instances
For ENG-4979, fix accidentally single threaded auth, make timeout message clearly about timeouts
Merge pull request #646 from VoltDB/ENG-4476-from_unixtime_alias

Add support for the alias sql function FROM_UNIXTIME
Merge pull request #645 from VoltDB/ENG-4977

ENG-4977: calculate correct width of index for pure column index and exp...
Merge pull request #648 from VoltDB/ENG-4979

For ENG-4979, fix accidentally single threaded auth, make timeout messag...
Merge pull request #649 from VoltDB/ENG-4967

Fix for ENG-4967, small stack size is a little too small, has caused ove...
Merge branch 'master' of https://github.com/VoltDB/voltdb into ENG-4938
code cleaning