added: now we have a fourth part in permissions (guests)

e.g.: 07555 means:
           7 for owner
           5 for group
           5 for others
           5 for guests (not logged users)
added:     the sticky bit for directories
           e.g. permissions to a directory with a sticky bit set
           can be set to: 017555
rewritten: rm/mv winix functions to correctly understand the sticky bit
added:     Dir::FollowLink() recognizes ".." and "." now
           consequently System::FollowAllLinks recognizes it too
added:     umask -- calculating privileges for new files/directories
           all users have their own umask (in meta)
           and there is one in the config
           (for guests and when a user has not definied its own one)
removed:   mount option: only_root_remove



git-svn-id: svn://ttmath.org/publicrep/winix/trunk@801 e52654a7-88a9-db11-a3e9-0013d4bc506e

functions/functionbase.cpp

@@ -2,7 +2,7 @@
  * This file is a part of Winix
  * and is not publicly distributed
  * 
- * Copyright (c) 2010-2011, Tomasz Sowa
+ * Copyright (c) 2010-2012, Tomasz Sowa
  * All rights reserved.
  * 
  */
@@ -19,8 +19,8 @@ FunctionBase::FunctionBase()
 
 	fun.user_id    = -1;
 	fun.group_id   = -1;
-	fun.privileges = 0755;
-	fun.parent_id  = -1; // !! temporarily doesn't matter
+	fun.privileges = 07555;
+	fun.parent_id  = -1;
 	fun.id         = -1;
 	fun.type       = Item::file;
 }