Implements a native Smalltalk connection to PostgreSQL backend. See the "Frontend/Backend Protocol" chapter in the "PostgreSQL Programmer's Guide" for more information.
1. Only "plaintext" and "md5" authentication modes are currently supported. This option is configurable via the pg_hba.conf file in your postgres server configuration.
2. If you want to use "md5" authentication, you must load the Cryptography package first, before loading this package.
3. If you only want to use "plaintext" authentication, it is not necessary to load the Cryptography package at all.
See the class TestPGConnection for example code of how to access the postgres.