Feature #800

- Added feature #800, adding a new command 'columns' that lists all the columns
  available for custom reports, and includes their formatting options (thanks
  to T. Charles Yun).

src/ViewText.cpp

@@ -115,7 +115,7 @@ std::string ViewText::render ()
   for (unsigned int col = 0; col < _columns.size (); ++col)
   {
     // Headers factor in to width calculations.
-    int global_min = utf8_length (_columns[col]->getLabel ());
+    int global_min = utf8_length (_columns[col]->label ());
     int global_ideal = global_min;
 
     for (unsigned int row = 0; row < _data.size (); ++row)