Update (doxygen) documentation; fix some code formatting

INSTALL.md

cmp_tool.c

doc/doxygen/Doxyfile.in

how_to_no_header.md

include/byteorder.h

include/cmp_data_types.h

include/cmp_entity.h

include/cmp_io.h

include/cmp_rdcu_cfg.h

include/cmp_rdcu_extended.h

include/cmp_support.h

include/my_inttypes.h

include/rdcu_cmd.h

include/rdcu_ctrl.h

include/rdcu_pkt_to_file.h

include/rdcu_rmap.h

include/rmap.h

lib/cmp_guess.c

lib/cmp_icu.c

lib/cmp_io.c