portable archive interchange change history

08/11/88 fix delta checksum bug involving header <dev,ino>
07/17/88 ----- first pax release -----
07/15/88 convert to pax
07/11/88 change putops(), addnumop(), addstrop() to *xop*()
	 change end of medium handler
06/22/88 call doupdate() rather than update()
	 emty files are valid archives
06/16/88 move *_header definition from cpio.h to cpio.c
06/01/88 add delta checksum and drop delta verify entries
05/24/88 use Phong's new delta/update interface
05/11/88 add -z for -io
05/10/88 complete libdelta additions for -z and -A options
05/03/88 add `-z file' delta/translate option
03/30/88 add dynamic buffer size
03/29/88 add tar interpretation for cpio file args
	 fix binary format file name output alignment bug
12/22/87 add CPIO_EXTENDED extended field code
12/08/87 recode for updated hash library interface
12/01/87 fix link hash bug that linked unrelated files
10/06/87 add `-e filter' file output filter option
08/18/87 delete verbose obsolete option warning
08/11/87 use standard cpio file types rather than local S_IFMT from sys/stat.h
06/11/87 ----- first release -----
05/01/87 first code