changelog
    
    
    - Fri, 01 Feb 2013 10:18:47 +0100
 
    - by Mike Becker <universe@uap-core.de> [Fri, 01 Feb 2013 10:18:47 +0100] rev 8
 
    - removed completeness test - the solver automatically returns false when the field is incomplete
 
    - 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
 
    - Sat, 26 Jan 2013 19:34:31 +0100
 
    - by Mike Becker <universe@uap-core.de> [Sat, 26 Jan 2013 19:34:31 +0100] rev 5
 
    - moved field methods to field class + added (parts of the) document handler
 
    - Sat, 26 Jan 2013 18:43:49 +0100
 
    - by Mike Becker <universe@uap-core.de> [Sat, 26 Jan 2013 18:43:49 +0100] rev 4
 
    - added NEW function
 
    - Sat, 26 Jan 2013 18:38:12 +0100
 
    - by Mike Becker <universe@uap-core.de> [Sat, 26 Jan 2013 18:38:12 +0100] rev 3
 
    - added license and main menu
 
    - Sat, 26 Jan 2013 17:42:07 +0100
 
    - by Mike Becker <universe@uap-core.de> [Sat, 26 Jan 2013 17:42:07 +0100] rev 2
 
    - check functions
 
    - Sat, 26 Jan 2013 15:48:59 +0100
 
    - by Mike Becker <universe@uap-core.de> [Sat, 26 Jan 2013 15:48:59 +0100] rev 1
 
    - init project + editable sudoku field