changelog
    
    
    - Tue, 07 May 2013 01:15:31 +0300
 
    - by Santeri Piippo <crimsondusk64@gmail.com> [Tue, 07 May 2013 01:15:31 +0300] rev 170
 
    - Added visibility toggling
 
    - Tue, 07 May 2013 00:22:01 +0300
 
    - by Santeri Piippo <crimsondusk64@gmail.com> [Tue, 07 May 2013 00:22:01 +0300] rev 169
 
    - Added grouping basics - will be needed for ext programs (Intersector, Isecalc and a lot of others use 2 or more inputs, need to get all of those in somehow...) plus I think they can be useful for the actual authoring process
 
    - Mon, 06 May 2013 15:39:45 +0300
 
    - by Santeri Piippo <crimsondusk64@gmail.com> [Mon, 06 May 2013 15:39:45 +0300] rev 168
 
    - Further work on ext programs, LDObjectType_e integrated into LDObject