Merge master: add cli_export, pdf_links; EDZ: 10-slot grid, group headers, ToS notice

- Resolve cmake/qet_compilation_vars.cmake conflict: keep both upstream's
  cli_export.cpp/h and pdf_links.cpp/h and the EDZ source additions.

- 10-position grid alignment: pin_y values are multiples of 10 so terminals
  snap cleanly to QET's default grid.  group_gap raised to 10 (one full slot).

- Named connector groups get a header label (group name) placed in the gap
  above the first pin, so the electrician sees block names (XDI, XPOW, …)
  without reading individual terminal designations.

- Device-tag dynamic_text now uses 9pt LABEL_FONT and y = min_y - 9 so it
  clears the element body and is legible at normal zoom.

- Add EPLAN Data Portal Terms of Use disclaimer to sources/import/edz/README.md.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sources/ElementsCollection/elementcollectionhandler.cpp

@@ -469,7 +469,7 @@ bool ElementCollectionHandler::setNames(ElementsLocation &location,
 			root.appendChild(name_list.toXml(document));
 			
 			QString filepath = location.fileSystemPath()
-					+ "/qet_directory";
+					% "/qet_directory";
 			if (!QET::writeXmlFile(document, filepath)) {
 				qDebug() << "ElementCollectionHandler::setNames : write qet-directory file failed";
 				return false;

sources/ElementsCollection/elementscollectionmodel.cpp

@@ -538,6 +538,16 @@ QList<QETProject *> ElementsCollectionModel::project() const
 */
 void ElementsCollectionModel::highlightUnusedElement()
 {
+		//Reset only the items currently highlighted in red, so elements that
+		//are no longer unused lose the highlight. Scoping to the red
+		//Dense4Pattern avoids touching other backgrounds (e.g. the amber
+		//"show this dir" highlight) and avoids needless updates on big
+		//collections (issue #159).
+	for (ElementCollectionItem *eci : items())
+		if (eci->background().style() == Qt::Dense4Pattern &&
+		    eci->background().color() == Qt::red)
+			eci->setBackground(QBrush());
+
 	QList <ElementsLocation> unused;
 
 	foreach (QETProject *project, m_project_list)

sources/ElementsCollection/elementslocation.cpp

@@ -523,7 +523,9 @@ bool ElementsLocation::isCompanyCollection() const
 */
 bool ElementsLocation::isCustomCollection() const
 {
-	return fileSystemPath().startsWith(QETApp::customElementsDirN());
+	const QString dir = QETApp::customElementsDirN();
+	const QString path = fileSystemPath();
+	return path == dir || path.startsWith(dir + QLatin1Char('/'));
 }
 
 /**

sources/ElementsCollection/fileelementcollectionitem.cpp

@@ -274,7 +274,9 @@ bool FileElementCollectionItem::isCompanyCollection() const
 */
 bool FileElementCollectionItem::isCustomCollection() const
 {
-	return fileSystemPath().startsWith(QETApp::customElementsDirN());
+	const QString dir = QETApp::customElementsDirN();
+	const QString path = fileSystemPath();
+	return path == dir || path.startsWith(dir + QLatin1Char('/'));
 }
 
 /**