suppress postgresql NOTICE messages, which tend to be dumped directly to the console by the client library (!) for various normal things such as IF EXISTS checks doing what they're meant to do.
implementing auto-increment key support for postgresql by implementing creation of implicit sequences as needed for sequence columns.  add test coverage.
fix creation of timestamp and date columns on postgresql when using the --alter option.  add test coverage.
add schema creation test coverage for CHAR and VARCHAR too