ui: project settings fix

* fixed open folder dialog in project settings.
* changed foreign key relation of component_access from the element to the edge table.

src/app/qt/element/QtDirectoryListBox.cpp

@@ -52,6 +52,9 @@ void QtListItemWidget::handleButtonPress()
 {
 	QFileDialog dialog(this);
 	QListView *l = dialog.findChild<QListView*>("listView");
+
+	dialog.setFileMode(QFileDialog::Directory);
+
 	if (l)
     {
         l->setSelectionMode(QAbstractItemView::SingleSelection);

src/app/qt/window/QtProjectSetupScreen.cpp

@@ -24,7 +24,6 @@ QtTextLine::QtTextLine(QWidget *parent)
 	m_data = new QtLineEdit(this);
 	m_data->setAttribute(Qt::WA_MacShowFocusRect, 0);
 	m_data->setObjectName("locationField");
-	m_data->setReadOnly(true);
 
 	m_button = new QPushButton("...");
 	m_button->setObjectName("moreButton");
@@ -33,7 +32,6 @@ QtTextLine::QtTextLine(QWidget *parent)
 	layout->addWidget(m_button);
 
 	connect(m_button, SIGNAL(clicked()), this, SLOT(handleButtonPress()));
-	connect(m_data, SIGNAL(focus()), this, SLOT(handleButtonPress()));
 }
 
 QString QtTextLine::getText()

src/lib/data/SqliteStorage.cpp

@@ -707,7 +707,7 @@ void SqliteStorage::setupTables()
 			"edge_id INTEGER, "
 			"type INTEGER NOT NULL, "
 			"PRIMARY KEY(id), "
-			"FOREIGN KEY(edge_id) REFERENCES element(id) ON DELETE CASCADE);"
+			"FOREIGN KEY(edge_id) REFERENCES edge(id) ON DELETE CASCADE);"
 	);
 }