ENG-4825: First crack at refactoring parameterConverter to work right.
ENG-4825: Fix broken tests. Tweak parameter conversion.
Fixed one conversion bug and changed some null handling code.
Fixed 3 whacko tests.
ENG-4825: Fix test that made bad choices but doesn't have to live with them.
ENG-4825: Take pmartel feedback and mass-rename variables.
ENG-4285: more pmartel feedback
ENG-4825: Last pmartel feedback makes a test a bit stronger.
Merge pull request #580 from VoltDB/ENG-4825-params

ENG-4825: First crack at refactoring parameterConverter to work right.