Printing support #1525: print tables in Browse Data and Execute SQL tabs

Added contextual menu entry and keyboard shortcut for printing the browsed
table with headers. If a region is selected, print those cells data.
Otherwise, print the entire table.

The HTML conversion used for clipboard is reused. Borders are added for
better visual output.

src/ExtendedTableWidget.h

@@ -8,6 +8,7 @@
 #include <QStyledItemDelegate>
 
 class QMenu;
+class QMimeData;
 class FilterTableHeader;
 namespace sqlb { class ObjectIdentifier; }
 
@@ -50,9 +51,11 @@ signals:
     void selectedRowsToBeDeleted();
 
 private:
+    void copyMimeData(const QModelIndexList& fromIndices, QMimeData* mimeData, const bool withHeaders, const bool inSQL);
     void copy(const bool withHeaders, const bool inSQL);
     void paste();
     QString escapeCopiedData(const QByteArray& data) const;
+    void openPrintDialog();
 
     void useAsFilter(const QString& filterOperator, bool binary = false);
     void duplicateUpperCell();