Separated documentation and revised modules info

doc/INSTALL.pgsql.txt

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+
+CREATE THE PostgreSQL DATABASE
+------------------------------
+
+Note that the database must be created with UTF-8 (Unicode) encoding.
+
+1. CREATE DATABASE USER
+
+   This step is only necessary if you don't already have a user set up (e.g.
+   by your host) or you want to create new user for use with Drupal only. The
+   following command creates a new user named "username" and asks for a
+   password for that user:
+
+     createuser --pwprompt --encrypted --no-adduser --no-createdb username
+
+   If everything works correctly, you'll see a "CREATE USER" notice.
+
+2. CREATE THE DRUPAL DATABASE
+
+   This step is only necessary if you don't already have a database set up (e.g.
+   by your host) or you want to create new database for use with Drupal only.
+   The following command creates a new database named "databasename", which is
+   owned by previously created "username":
+
+     createdb --encoding=UNICODE --owner=username databasename
+
+   If everything works correctly, you'll see a "CREATE DATABASE" notice.