AuthPGAuthoritative yes/no
	Use or not use PostgreSQL authentication.
	(default is no)
PGhost hostname
	Set database host.
	(default is `localhost')
PGport portno
	Set database port number.
	(default is 5432)
PGdbname dbname
	Set database name.
	(default is `proftpd')
PGdbuser db-username
	Set user name for database authentication.
	(default is `wwwdata')
PGdbpasswd db-password
	Set password for database authentication.
	(default is NULL)
PGusertable tablename
	Set table name.
	(default is `user')
PGencrypted yes/no
	Use or not use encrypted password.
	(default is yes)
PGuidMap uidnum
	Users which authenticated with PostgreSQL are mapped into a
	user specified by this directive.
	(default is 65534)
PGgidMap gidnum
	Users which authenticated with PostgreSQL are mapped into a
	group specified by this directive.
	(default is 65534)
PGuidField uidfield
	Set field name of user id.
	(default is `uid')
PGpwdField passwordfield
	Set field name of password.
	(default is `passwd')
PGhomeField homedirfield
	Set field name of home directory.
	(default is `home')
