Restore ad hoc SP DML functionality, beef up plannertester aggs suite, pare down PlannerTestAideDeCamp.
ENG-4410 ee support for IN <list of constants>, passing unit tests, not yet wired into AbstractExpression eval.
Merge branch 'master' into ENG-4410-ee-in-list
EE in list support for rhs in ARRAY parameter or general expression form
ENG-4410 add the bits and pieces missing from the last commit
Merge branch 'master' into ENG-4076
ENG-4410 Commenting and removal of ARRAY NValue from string deserialize stubs re:r=jhugg
Merge branch 'master' into ENG-4410-ee-in-list
ENG-4764: This path which advances the SPI master's TxnEgo on
truncation snapshot completion callback evaded the InitiatorMailbox
lock.
Merge branch 'master' into ENG-4076
Comment tweak re:r=jhugg
Merge pull request #538 from VoltDB/ENG-4076

Depends on pro branch. Merge that first.
Merge pull request #537 from VoltDB/ENG-4410-ee-in-list

Eng 4410 ee in list
Merge branch 'master' of https://github.com/VoltDB/voltdb
strengthen the test, maybe