cleanup head and tail of configure.ac and introduce a few comments so the stuff is easier to read
cleanup head and tail of configure.ac and introduce a few comments so the stuff is easier to read

devzero2000/RPM5,devzero2000/RPM5,devzero2000/RPM5,devzero2000/RPM5,devzero2000/RPM5,devzero2000/RPM5,devzero2000/RPM5