Merge branch 'master' into ENG-5863
For ENG-6247, fix a few test blocking bugs
ENG-5945 Allow ALTER COLUMN <redef> to explicitly enable/preserve NOT NULL
Tweak comment.
Remove obsoleted m_serializedCatalog member
For ENG-6247, fix test bugs
For ENG-6247, provide necessary byte ordering for decimal
For ENG-6247, attempt #2 at getting test byte ordering working
Merge branch 'master' into dr-integration
Merge branch 'dr-integration' into ENG-6247
Redo Web Studio command and parameter parser/splitters.
For ENG-6247, only use a byte for scale and precision
Merge branch 'master' into dr-integration
Merge branch 'dr-integration' into ENG-6247
Merge branch 'master' into ENG-5955-studio
Merge pull request #1370 from VoltDB/ENG-6247

Eng 6247
ENG-5900: Add initial SQL "lexer"
ENG-5900: Move common fields: ProcedureInvocationType, originalTxnId,
and originalUniqueId to AsyncCompilerWork base class.
ENG-5900: Push adhoc DDL statements through to the
AsyncCompilerAgentHelper and then reject them there.
ENG-6121: Add drop table tests.  Wire largely functional adhoc DDL path
together.  Some hackery for the error reporting path.