Merge branch 'master' into ENG-4291-statementxml
ENG-4279 Fix argument validation and -h help output.
Merge pull request #365 from VoltDB/notest-ENG-4279

ENG-4279 Fix argument validation and -h help output.
Merge pull request #363 from VoltDB/ENG-4291-statementxml

Eng 4291 Statement-level XML refactoring (See summary in this pull request comment).
ENG-2669 remove setting attributes during SFTP copy operations
Merge pull request #364 from VoltDB/ENG-4291-ddlxml

ENG-4291 (partial) refactoring: DDL XML
Merge pull request #367 from VoltDB/ENG-2669

ENG-2669 remove setting attributes during SFTP copy operations
ENG-4311: Re-introduce new and improved measure-overhead app.
Allows setting for proportion of varios types of txns.
Allows setting payload size as well.
See readme for parameter info.

Future work:
JSON interface? AdHoc?
Tweak sqlcoverage advance-template to avoid known VoltDB/HSQL Backend discrepencies handling the exact value 2^31.
Merge branch 'master' into ENG-4291-expressions