Add missing QTreeWidget::dropEvent to d'n'd atempt occuring in same location.

Remove 'Overwrite attempt' dialog as obsolete. Now moving item, e.g. from folder to same folder, will just make it the last child of the folder.

Conflicts:
	src/rss/rss_imp.cpp

src/rss/feedlistwidget.cpp

@@ -205,7 +205,7 @@ void FeedListWidget::dropEvent(QDropEvent *event) {
   foreach (QTreeWidgetItem *src_item, src_items) {
     RssFilePtr file = getRSSItem(src_item);
     if (dest_folder->hasChild(file->id())) {
-      emit overwriteAttempt(file->id());
+      QTreeWidget::dropEvent(event);
       return;
     }
   }

src/rss/feedlistwidget.h

@@ -71,7 +71,6 @@ public slots:
 
 signals:
   void foldersAltered(const QList<QTreeWidgetItem*> &folders);
-  void overwriteAttempt(const QString &filename);
 
 private slots:
   void updateCurrentFeed(QTreeWidgetItem* new_item);

src/rss/rss_imp.cpp

@@ -167,12 +167,6 @@ void RSSImp::askNewFolder() {
   }
 }
 
-void RSSImp::displayOverwriteError(const QString &filename) {
-  QMessageBox::warning(this, tr("Overwrite attempt"),
-                       tr("You cannot overwrite %1 item.", "You cannot overwrite myFolder item.").arg(filename),
-                       QMessageBox::Ok);
-}
-
 // add a stream by a button
 void RSSImp::on_newFeedButton_clicked() {
   // Determine parent folder for new feed
@@ -668,7 +662,6 @@ RSSImp::RSSImp(QWidget *parent) : QWidget(parent), m_rssManager(new RssManager)
 
   connect(m_feedList, SIGNAL(currentItemChanged(QTreeWidgetItem*,QTreeWidgetItem*)), this, SLOT(refreshArticleList(QTreeWidgetItem*)));
   connect(m_feedList, SIGNAL(foldersAltered(QList<QTreeWidgetItem*>)), this, SLOT(updateItemsInfos(QList<QTreeWidgetItem*>)));
-  connect(m_feedList, SIGNAL(overwriteAttempt(QString)), this, SLOT(displayOverwriteError(QString)));
 
   connect(listArticles, SIGNAL(itemSelectionChanged()), this, SLOT(refreshTextBrowser()));
   connect(listArticles, SIGNAL(itemDoubleClicked(QListWidgetItem *)), this, SLOT(downloadTorrent()));

src/rss/rss_imp.h

@@ -78,7 +78,6 @@ private slots:
   void askNewFolder();
   void saveFoldersOpenState();
   void loadFoldersOpenState();
-  void displayOverwriteError(const QString &filename);
   void on_actionManage_cookies_triggered();
   void on_settingsButton_clicked();
   void on_rssDownloaderBtn_clicked();