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Arguments:
<p>
<table border=1 cellspacing=0>
<tr><th> Start
<td> Indicates the start of an subcircuit list; call this before any
<arg>Need</arg> actions.
<tr><th> Need
<td> Searches the board for an subcircuit with a matching refdes. <br>
If found, the value and footprint are updated. <br>
If not found, a new subcircuit is created with the given
footprint and value.
<tr><th> Done
<td> Compares the list of subcircuits needed since the most recent
<arg>Start</arg> with the list of subcircuits actually on the
board. Any subcircuits that weren't listed are selected, so
that the user may delete them.
</table>
<p>
Placement of new subcircuits depends on conf node
import/footprint_placement/method, which is a string containing
a one word instruction that is one of:
<p>
<table border=1 cellspacing=0>
<tr><th> disperse
<td> place all new subcircuits at randomized coordinates around
<i>location</i>, within a distance configured in
import/footprint_placement/disperse
<tr><th> frame
<td> place all new subcircuits close outside of the drawing area,
"framing" the design
</table>
<p>
<i>Location</i> is a string instruction specified by
import/footprint_placement/location, the value is one of:
<p>
<table border=1 cellspacing=0>
<tr><th> (empty, no value)
<td> place around the coordinates specified in coords
import/footprint_placement/x and import/footprint_placement/y
<tr><th> center
<td> place around the center of the drawing area
<tr><th> mark
<td> place around the mark (or center of the drawing area if no mark present
at the moment of import)
</table>
<p>
Removal of excess subcircuits (the ones present on the board but not in
the new netlist) depends on conf node import/footprint_removalt/method,
which is a string containing a one word instruction that is one of:
<p>
<table border=1 cellspacing=0>
<tr><th> select (or empty)
<td> select excess subcircuits (an {s r} after the import removes them)
<tr><th> remove
<td> automatically remove excess subcircuits
<tr><th> list
<td> no change on excess subcircuit data on the board, but
open a view list dialog enumerating them
</table>
<p>
Note: subcircuits with the nonetlist flag set or empty/missing refdes
will not be taken as excess even if they are not present on the netlist.
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