Display grid
It is possible to display a unit grid 
under each DR. GEO figure. 
The corresponding command can be accessed from the 
Edition->Show or hide grid menu.
It can also be activated from the Ctrl-G shortcut.
If the command is activated again, the grid is hidden.
The grid is a unit grid: each subdivision corresponts to one unit. 
Also, if the grid is apparent when the figure is being saved, 
then the grid is saved too.
Any comments/remarks? 
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