requires the schema to be explicit; i.e. ForeignKey('alt_schema.users.id')
- the fix in "schema" above fixes postgres reflection of foreign keys from an
alt-schema table to a public schema table
- added support for reflection of domains [ticket:570]
- types which are missing during reflection resolve to Null type
instead of raising an error
- moved reflection/types/query unit tests specific to postgres to new
postgres unittest module