Added private projects.

It is now possible to create private projects. To mark a project as
private, you simply go in the Administer > Tabs Access menu and select
"Private project". Only project members and owners together with the
extra authorized users will be able to access the project. The project
will not appear in the list of projects for not authorized users.

src/IDF/conf/idf.php-dist

@@ -122,9 +122,15 @@ $cfg['db_password'] = '';
 $cfg['db_server'] = '';
 $cfg['db_version'] = '';
 $cfg['db_table_prefix'] = ''; 
+
+// ** DO NOT USE SQLITE IN PRODUCTION ** 
+// This is not because of problems with the quality of the SQLite
+// driver or with SQLite itself, this is due to the lack of migration
+// support in Pluf for SQLite, this means we cannot modify the DB
+// easily once it is loaded with data.
 $cfg['db_engine'] = 'PostgreSQL'; // SQLite is also well tested or MySQL
 $cfg['db_database'] = 'website'; // put absolute path to the db if you
-                                 // are using SQLite
+                                 // are using SQLite. 
 
 // -- From this point you should not need to update anything. --
 $cfg['pear_path'] = '/usr/share/php';