int wng_open(struct writer_node_group *g);
void wng_close(struct writer_node_group *g);
struct writer_node_group *wng_new(unsigned num_writers);
-void init_supported_writers(void);
+void writer_init(void);
void *check_writer_arg(const char *wa, int *writer_num);
struct writer_node_group *setup_default_wng(void);
void print_writer_helps(int detailed);