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Changes the grid offset to relative or absolute x_offs and y_offs.
For non-zero values always use units, e.g. SetGrifOffs(0.5mm, 0.1mm).
<p>
The final grid offset alues will be scaled down so they are always between
0 and the current grid size. For example with a 25 mil grid, a value of
7mil will be taken as 7mil offset, but a value of 27 mil will be taken
as a 2mil offset.
<p>
If an offset starts with + or -, it is taken as relative, which means it
is added to the current offset value.
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