Clarified documentation for configuring the database settings. See Gi…

…tHub Issue #3801.

INSTALL

@@ -396,6 +396,11 @@ Then define your database connection parameters. Set the values for:
     $db_login =     The database login username
     $db_password =  The database login password for the above login username
 
+If you are using cPanel on your web server, make sure you include the prefix,
+typically 8 characters followed by an underscore, in your database name and
+database username.  For example $db_database = "abcdefgh_mrbs". (Note: this
+prefix is not the same as the table prefix below.)
+
 If the database server and web server are the same machine, use
 $db_host="localhost". Or, with PostgreSQL only, you can use $db_host="" to
 use Unix Domain Sockets to connect to the database server on the same machine.

web/config.inc.php-sample

@@ -47,6 +47,12 @@ require_once 'lib/autoload.inc';
 /*******************
  * Database settings
  ******************/
+
+// If you are using cPanel on your web server, make sure you include the prefix,
+// typically 8 characters followed by an underscore, in your database name and
+// database username.  For example $db_database = "abcdefgh_mrbs". (Note: this
+// prefix is not the same as the table prefix below.)
+
 // Which database system: "pgsql"=PostgreSQL, "mysql"=MySQL
 $dbsys = "mysql";
 // Hostname of database server. For pgsql, can use "" instead of localhost