* Don't write flash if unchanged
 * use cmp instead of md5sum
 * refs #2380


git-svn-id: file:///var/svn/freetz/trunk@11756 149334a1-2f27-0410-a3b9-fc62619ac1e6
modusers:
 * don't suppress error messages
 * return failure status on error
 * use "cp -p" to preserve times to avoid unnecessary saves (refs #2380)


git-svn-id: file:///var/svn/freetz/trunk@11757 149334a1-2f27-0410-a3b9-fc62619ac1e6