add [pragma GCC diagnostic ignored "-Wfloat-equal"] in util.h, except for `make dpirs` for debug version(-DWITH_DEBUG).
	modified:   Makefile
add Autotools files
midway...
	modified:   pirs/Makefile
	renamed:    src/pirs/Makefile -> src/pirs/gccMakefile
	modified:   Makefile
	new file:   srclean.sh, genauto.sh
	modified:   srclean.sh