change account deletion process

The account deletion was performed by solely clicking the bin icon
in the configuration account panel of a selected account.
This was done without warning nor confirmation.

This patch moves the dedicated button to the account list bottom
as in the other desktop clients, and adds a confimation popup,
summarising the account identifiers (in order, alias, registered name,
ringID), and displays a warning about losing the account in case
it hasn't been exported or added to another device.

Change-Id: I259388da9e143400ab65e88d1fb7c223dbfbff19
Reviewed-by: Anthony Léonard <anthony.leonard@savoirfairelinux.com>
diff --git a/deleteaccountdialog.h b/deleteaccountdialog.h
new file mode 100644
index 0000000..c247cc9
--- /dev/null
+++ b/deleteaccountdialog.h
@@ -0,0 +1,50 @@
+/***************************************************************************
+ * Copyright (C) 2015-2017 by Savoir-faire Linux                           *
+ * Author: Olivier Soldano <olivier.soldano@savoirfairelinux.com>          *
+ *                                                                         *
+ * This program is free software; you can redistribute it and/or modify    *
+ * it under the terms of the GNU General Public License as published by    *
+ * the Free Software Foundation; either version 3 of the License, or       *
+ * (at your option) any later version.                                     *
+ *                                                                         *
+ * This program is distributed in the hope that it will be useful,         *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
+ * GNU General Public License for more details.                            *
+ *                                                                         *
+ * You should have received a copy of the GNU General Public License       *
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.   *
+ **************************************************************************/
+
+#ifndef DELETEACCOUNTDIALOG_H
+#define DELETEACCOUNTDIALOG_H
+
+#include <QDialog>
+#include <QModelIndex>
+
+namespace Ui {
+class DeleteAccountDialog;
+}
+
+class DeleteAccountDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    DeleteAccountDialog(const QModelIndex & idx, QWidget *parent = 0);
+    ~DeleteAccountDialog();
+
+signals:
+    deleteAcceptClicked();
+
+private slots:
+    void on_deleteCancelBtn_clicked();
+
+    void on_deleteAcceptBtn_clicked();
+
+private:
+    Ui::DeleteAccountDialog *ui;
+    QModelIndex index_;
+};
+
+#endif // DELETEACCOUNTDIALOG_H