get_virtual_columns and get_virtual_column_names method added similar to existing get_columns and get_column_names methods
get_virtual_columns and get_virtual_column_names method added similar to existing get_columns and get_column_names methods

andrewyatz/public-plugins,muffato/public-plugins,Ensembl/public-plugins,andrewyatz/public-plugins,andrewyatz/public-plugins,muffato/public-plugins,muffato/public-plugins,andrewyatz/public-plugins,muffato/public-plugins,andrewyatz/public-plugins,Ensembl/public-plugins,Ensembl/public-plugins