Look for Overlapping objects

[Vadoola]

This would be a complicated feature, but if a 2d dxf is exported from a 3d one by looking through a specific viewport, you might end up with shapes that overlap and aren't really visible. It might be nice to clean these up and not put them in the resulting element file. This would simplify the element and likely improve performance (of QET with the converted element file) but would add significant complexity to dxf2elmt.

Like Issue #15, in order to do this I need to look at objects as a group and try to determine if they overlap, and do they partially or fully overlap, etc, as the number of objects in the dxf increase you would get combinatorial growth of the processing needed to check.

I could try and start with an easier route. After I get clean up and get the block importing finalized I could try and do some checking, just within each block. This would reduce the number of combinations that need to be processed.