-void mutt_group_add_adrlist (group_t *, ADDRESS *);
-void mutt_group_context_add (group_context_t **ctx, group_t *group);
-void mutt_group_context_destroy (group_context_t **ctx);
-void mutt_group_add_adrlist (group_t *g, ADDRESS *a);
-void mutt_group_context_add_adrlist (group_context_t *ctx, ADDRESS *a);