PING! new "--mismatch-only" option for md5sum and sha1sum

[Kelley Cook]

No-one made any comments on this patch:
http://lists.gnu.org/archive/html/bug-coreutils/2004-10/msg00006.html

I still think that adding in a --mismatch-only option to md5sum and 
sha1sum would be a good idea as the mostly equivalent 'md5sum -c MD5SUM 
| grep -v "OK$"' is not I18 compliant as the "OK" would be translated 
differently for each locale.  That particular "equivilent" also happens 
to lose the *sum programs result code.

Kelley Cook