Use PascalCase for Qt client filenames

Split FileTree.{h,cc} and FilterBar.{h,cc} files so that each class
is in its own file.

This breaks translations (some classes got renamed => context changed),
to be fixed by next commit (along with Tx sync).

qt/TrackerModelFilter.cc

@@ -0,0 +1,33 @@
+/*
+ * This file Copyright (C) 2010-2015 Mnemosyne LLC
+ *
+ * It may be used under the GNU GPL versions 2 or 3
+ * or any future license endorsed by Mnemosyne LLC.
+ *
+ * $Id$
+ */
+
+#include "TrackerModel.h"
+#include "TrackerModelFilter.h"
+
+TrackerModelFilter::TrackerModelFilter (QObject * parent):
+  QSortFilterProxyModel (parent),
+  myShowBackups (false)
+{
+}
+
+void
+TrackerModelFilter::setShowBackupTrackers (bool b)
+{
+  myShowBackups = b;
+  invalidateFilter ();
+}
+
+bool
+TrackerModelFilter::filterAcceptsRow (int                 sourceRow,
+                                      const QModelIndex & sourceParent) const
+{
+  QModelIndex index = sourceModel()->index(sourceRow, 0, sourceParent);
+  const TrackerInfo trackerInfo = index.data(TrackerModel::TrackerRole).value<TrackerInfo>();
+  return myShowBackups || !trackerInfo.st.isBackup;
+}