Element editor : minor fix

In the part list widget, the terminal name is empty if terminal haven't
got name.
Now "terminal" is always displayed and if the terminal have a name the
name is appended to "terminal".
Example :
if the terminal name is 24 then the the part list widget show "terminal
: 24"

sources/editor/graphicspart/partterminal.cpp

@@ -179,10 +179,10 @@ qreal PartTerminal::rotation() const {
 }
 
 /**
-	@brief PartTerminal::setName
+	@brief PartTerminal::setTerminalName
 	@param name
 */
-void PartTerminal::setName(QString& name) {
+void PartTerminal::setTerminalName(const QString& name) {
 	if (d -> m_name == name) return;
 	d -> m_name = name;
 	emit nameChanged();