Provides an "all" style link to reset the facets.
The $display_plugin_id and $display_plugin_definition are provided for convenience when overriding this method.
string $display_plugin_id: The plugin ID of the plugin we are currently parsing a facet link from.
array $display_plugin_definition: The plugin definition we are parsing.
string Returns a simple URL string for use within l().
protected function allPluginsUrl($display_plugin_id, $display_plugin_definition) {
$plugin_definition = $this
->getPluginDefinition();
return $plugin_definition['path'] . '/' . $this
->getPluginId() . '/add';
}