- Added testbase.Table and testbase.Column, interceptors that can set up

- Added testbase.Table and testbase.Column, interceptors that can set up
  test-run- and dialect-specific options on those objects
  All tests re-pointed to go through the interceptors
- Removed mysql_engine= from table declarations, replaced with a general
  flag indicating storage requirements
- Added ability to choose a global MySQL storage engine for all tests
  --mysql-engine=<whatever>
  If none is specified, tests use the old db-default/InnoDB behavior
- Added ability to append arbitrary table creation params
  --table-option=KEY=VALUE
  For MySQL 3, use this to set mysql_type instead of --mysql-engine
- Removed a couple dead test modules