changelog
    
    
    - Thu, 31 Jan 2013 18:44:44 +0100
 
    - by Mike Becker <universe@uap-core.de> [Thu, 31 Jan 2013 18:44:44 +0100] rev 7
 
    - added solving algorithm
 
    - Sun, 27 Jan 2013 15:03:57 +0100
 
    - by Mike Becker <universe@uap-core.de> [Sun, 27 Jan 2013 15:03:57 +0100] rev 6
 
    - file IO