profile_add_node
errcode_t profile_add_node
retval = profile_add_node(state->root_section,
retval = profile_add_node(state->current_section,
profile_add_node(state->current_section, tag, value, &node);
retval = profile_add_node(section, *cpp, 0, §ion);
retval = profile_add_node(section, *cpp, new_value, 0);