Allow viewing via the EditDialog for executed sql statements (#570)

* Allow viewing via the EditDialog for executed sql statements

Editing is disallowed, becuase we do not know which table the freeform
query operates on

* Fix whitespace

* Don't crash when changing to 'Execute SQL' tab when no database selected

* Add double click action

* A small usability improvement and indentation changes suggested by @MKleusberg

src/SqlExecutionArea.cpp

@@ -66,6 +66,12 @@ SqlTextEdit *SqlExecutionArea::getEditor()
     return ui->editEditor;
 }
 
+ExtendedTableWidget *SqlExecutionArea::getTableResult()
+{
+    return ui->tableResult;
+}
+
+
 QTextEdit* SqlExecutionArea::getResultView()
 {
     return ui->editErrors;