This brings the code in line with the recent centralized string design.
#define _di_f_string_format_SS_single_s_
#define _di_f_string_format_S_double_s_
#define _di_f_string_format_S_s_
-#define _di_f_string_format_S_single_s_
+//#define _di_f_string_format_S_single_s_
#define _di_f_string_format_UII_s_
#define _di_f_string_format_UI_s_
#define _di_f_string_format_ULL_s_
build_sources_program fll/level_1/print.c fll/level_1/private-print.c fll/level_1/print/common.c
build_sources_program fll/level_1/status_string.c
-build_sources_program fll/level_2/error.c fll/level_2/private-error.c fll/level_2/error/common.c
+build_sources_program fll/level_2/error.c fll/level_2/private-error.c fll/level_2/error/common.c fll/level_2/error/string.c
build_sources_program fll/level_2/fss.c fll/level_2/fss/basic.c fll/level_2/fss/basic_list.c fll/level_2/fss/embedded_list.c fll/level_2/fss/extended.c fll/level_2/fss/extended_list.c fll/level_2/fss/payload.c
build_sources_program fll/level_2/print.c
build_sources_program fll/level_2/program.c fll/level_2/program/common.c fll/level_2/program/print.c fll/level_2/private-program.c