Adding supportto MsAccess via UCanAccess

Furthermore, added UnsupportedDataType type in order to allow unsupported columns' data types to be exported
Adding support to MsAccess; Added PostgreSQL initDatabase()

With initDatabase(), now a export to Postgres auto creates the needed database
Updated the way MySQLExportModule creates new schemas (databases)
merge with init db
minor fix (uncommented 2 lines previously commented for testing purposes)