specctra_export to handle Edge Cuts graphics in modules

    // get all the DRAWSEGMENTS into 'items', then look for layer == EDGE_N,

    // and those segments comprise the board's perimeter.

    static const KICAD_T  scanDRAWSEGMENTS[] = { PCB_LINE_T, EOT };

    static const KICAD_T  scan_graphics[] = { PCB_LINE_T, PCB_MODULE_EDGE_T, EOT };

    items.Collect( aBoard, scanDRAWSEGMENTS );

    bool haveEdges = false;

    items.Collect( aBoard, scan_graphics );

    for( int i=0;  i<items.GetCount();  )

    {

        DRAWSEGMENT* item = (DRAWSEGMENT*) items[i];

        wxASSERT( item->Type() == PCB_LINE_T );

        if( item->GetLayer() != EDGE_N )

        if( items[i]->GetLayer() != EDGE_N )

        {

            items.Remove( i );

        }

        else

        else    // remove graphics not on EDGE_N layer

        {

            haveEdges = true;

            ++i;

            D( item->Show( 0, std::cout );)

        }

    }

    if( haveEdges )

    if( items.GetCount() )

    {

        PATH*  path = new PATH( boundary );

        boundary->paths.push_back( path );