The edit-object is a line object (extobj::role=edit, on any layer). There
can be multiple edit-objects.
Vias are placed at the defined pitch. If a via would be too close to
any other padstack already on the board, it is not placed.
<p>
<a href="../extobj">Extobj</a> details:
<ul>
	<li> the edit-object is the base line, typically on a doc layer
	<li> the extobj attribute should be <i>line-of-vias</i>
	<li> pitch is set using extobj::pitch (a decimal number with a unit)
</ul>
<p>
An example/test <a href="lov.lht">board</a> is available.
<p>
Demo video:
<p>
<video width="100%" controls>
	<source src="https://archive.org/download/pcb-rnd-lov2/lov2.ogv" type="video/ogg">
	(Your browser does not support the video tag, please download the
	<a href="https://archive.org/download/pcb-rnd-lov2/lov2.ogv">
	video file</a> instead.)
</video>
<p>
Steps shown in the video:
<ul>
	<li> 1. optional: create a new extobj layer group and layer. When done, this
	        can be used to avoid the edit-object interfering with the board.
	        By user convention the new layer group should be a global doc
	        layer and the purpose should be 'extobj'.
	<li> 2. draw the line
	<li> 3. use the menu or {e s x} to convert the line into an extended object
	<li> 4. edit the geometry by grabbing the edit-object line or its endpoints
	<li> 5. edit properties by right clicking on the 'E' mark
</ul>