Internal use: render a feature file into a panel
@args = $self->create_panel_args($section,$args);
Return arguments need to create a Bio::Graphics::Panel. $section is one of 'detail','overview', or 'region' $args is a hashref that contains the keys:
keystyle title image_class postgrid background
($start,$stop,$flip) = $self->segment_coordinates($segment,$flip)
Method to correct for rare case in which start and stop are flipped.
@args = $self->create_track_args($label,$args);
Return arguments need to create a Bio::Graphics::Track. $label is a config file stanza label for the track.