changelog
    
    
    - Sun, 11 Mar 2018 16:13:22 +0200
 
    - by Santeri Piippo [Sun, 11 Mar 2018 16:13:22 +0200] rev 1280
 
    - fixed: LDDocument created one removal connection to the model for each object added, so removing an object from a model of 9 objects added 9 deletion entries to history
 
    - Thu, 08 Mar 2018 11:39:18 +0200
 
    - by Santeri Piippo [Thu, 08 Mar 2018 11:39:18 +0200] rev 1279
 
    - renamed signal
 
    - Thu, 08 Mar 2018 11:36:55 +0200
 
    - by Santeri Piippo [Thu, 08 Mar 2018 11:36:55 +0200] rev 1278
 
    - moved LDObject indices from a global array into Model