Add options to leave junctions and contact blocks out of the parts list (#1178)

Since #849 the parts list has a row for every contact block (slave) and
terminal-type element. Users who draw the dots and bends where wires
branch as terminal-type symbols (114_connections) get one empty row per
junction: 109 of 151 rows on one reported cabinet.

Two options, both off by default so existing exports are unchanged:
- leave out the contact blocks: --no-slaves, "no_slaves" in qet_export,
  or uncheck the new "Contacts esclaves" element type in the dialog;
- leave out the junctions: terminal-type elements with no label,
  designation, manufacturer or manufacturer reference. --no-junctions,
  "no_junctions", or "Laisser de côté les jonctions" in the dialog.
  A terminal block with a label or a part number stays.

The element type filter had no box for slaves, so every query it built
left them out: the export dialog never listed contact blocks, although
the command line has since #849. The dialog now checks the new box by
default and gives the same rows as --export-bom. The box is unchecked by
default elsewhere, so nomenclature tables keep their rows.

docs/smart-device-bom.md still said slaves and terminals were excluded;
corrected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

sources/ui/bomexportdialog.cpp

@@ -46,6 +46,9 @@ BOMExportDialog::BOMExportDialog(QETProject *project, QWidget *parent) :
 	m_query_widget = new ElementQueryWidget(this);
 	ui->m_main_layout->insertWidget(0, m_query_widget);
 	m_query_widget->setQuery(BomExport::defaultQuery());
+		//The contact blocks are parts of their own, as in the command line
+		//export; unchecking "Contacts esclaves" leaves them out.
+	m_query_widget->setSlavesIncluded(true);
 	on_m_format_as_bom_clicked(false);
 
 	m_preview_model = new QSqlQueryModel(this);
@@ -145,6 +148,15 @@ void BOMExportDialog::on_m_format_as_bom_clicked(bool checked) {
 	m_query_widget->setCount("COUNT(*) AS designation_qty", checked);
 }
 
+/**
+	@brief BOMExportDialog::on_m_no_junctions_clicked
+	@param checked : true leaves out the junctions, see
+	BomExport::junctionFilter()
+*/
+void BOMExportDialog::on_m_no_junctions_clicked(bool checked) {
+	m_query_widget->setExtraFilter(BomExport::junctionFilter(), checked);
+}
+
 /**
 	@brief BOMExportDialog::on_m_preview_pb_clicked
 	Run the current query and show its result live, without going through