Revert the delete as we go optimization for aggregate and union
Merge pull request #1402 from VoltDB/ENG-6403-valgrind

Revert the delete as we go optimization for aggregate and union
Removed slashes from table names
ENG-6409: Add switchable overflowing client.
Merge pull request #1405 from VoltDB/ENG-6409

ENG-6409: Add switchable overflowing client.