changelog
    
    
    - Thu, 09 Feb 2017 13:05:31 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Thu, 09 Feb 2017 13:05:31 +0200] rev 1104
 
    - Moved document editing methods from GLRenderer to Canvas
 
    - Thu, 09 Feb 2017 11:53:55 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Thu, 09 Feb 2017 11:53:55 +0200] rev 1103
 
    - Created a new GLRenderer derivative class "Canvas" and made MainWindow use it
 
    - Thu, 09 Feb 2017 01:08:57 +0200
 
    - by Teemu Piippo <teemu@hecknology.net> [Thu, 09 Feb 2017 01:08:57 +0200] rev 1102
 
    - Cleaned up code in LDDocument and removed unnecessary flags and methods. Flags turned into bools.