Made FilesTreeWidget work

It wasn't as easy as I thought. Quite big changes:

1. I changed the query for setIds in FilesTreeModel. Initially it
executed a database query for every id. Changed it to WHERE
seriespart_id IN (ids). I didn't have a chance to test the first
version, but this one is blazing fast.

2. Fixed a recursio ad infinitum in FilesTreeModel. This happens if you
call data() from data(). Either use the *item or use a role different
from what you've been called.

3. Introduce a new function in SeriesTreeModel: QList<QVariant>
childrenColumnList. It returns a QList from the children values of the
given column.

4. Lot's of UI changes. Hide unneded columns, align the remaining ones
properly.

What doesn't work:
we can't let the database do the sorting of files. We need a proxy for
this.

1 files changed, 8 insertions, 0 deletions

diff --git a/filestreewidget.cpp b/filestreewidget.cpp
index 5b1211d..e8afe7c 100644
--- a/filestreewidget.cpp
+++ b/filestreewidget.cpp
@@ -5,14 +5,22 @@
   2 of the License, or (at your option) any later version.
 */
 
+#include <QHBoxLayout>
+
 #include "filestreewidget.h"
 #include "smmodelsingleton.h"
 #include "filestreemodel.h"
 
 FilesTreeWidget::FilesTreeWidget(QWidget *parent) : QWidget(parent){
+	//the view
 	mView = new FilesTreeView;
 	mModel = static_cast<FilesTreeModel*>(SmModelSingleton::instance()->model("FilesModel"));
 	mView->setModel(mModel);
+
+	//layout
+	QHBoxLayout *mainLayout = new QHBoxLayout;
+	mainLayout->addWidget(mView);
+	setLayout(mainLayout);
 }
 
 FilesTreeView::FilesTreeView(QWidget *parent) : QTreeView(parent) {}