ENG-4291 (partial) Refactor the statement/clause level of the parser XML interface.
Merge branch 'master' into ENG-4291-statementxml
Merge branch 'master' into ENG-4291-statementxml
Merge pull request #363 from VoltDB/ENG-4291-statementxml

Eng 4291 Statement-level XML refactoring (See summary in this pull request comment).