show_columns method can contain hashref for each column
show_columns method can contain hashref for each column

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