[mch2021-terrain] DXF export

[Bart]

I think I have a better DXF export now:

https://cloud.ifcat.org/index.php/s/dXyiqKsngHGL92t

It turns out that DXF Trueview doesn't work under linux :( So I can't 
test right now. If the file doesn't work, I'll borrow my work PC some 
time to do more testing.

I've found an online viewer that works, and I did some prelimarary 
testing on a windows PC at work, so I have reason to believe the above 
file should work in autocad. The only problem is the layer order, but I 
don't think that's a big deal for you.

Right now I'm using the "Export Layers to DXF" from the processing 
toolbox, as it allows me to set an extent.

These are the settings:

     "CRS": "EPSG:28992",
     "ENCODING": "cp1252",
     "EXPORT_LINES_WITH_ZERO_WIDTH": false,
     "EXTENT": 
"111259.688100000,112477.388100000,522653.494000000,523514.494000000 
[EPSG:28992]",
     "FORCE_2D": false,
     "MAP_THEME": null,
     "MTEXT": true,
     "SELECTED_FEATURES_ONLY": false,
     "SYMBOLOGY_MODE": Symbol Layer Symbology
     "SYMBOLOGY_SCALE": 1000.0,
     "USE_LAYER_TITLE": false

It seems like the Symbology Scale is really important, with 1:1000000 
(the details) stuff goes nuts.

As soon as there is a login for NUTS for the database, I will give you 
the qgis project used to generate it. I will also give instructions on 
the quick way to do this using a python script.

Regards,

Bart