Pull up following revision(s) (requested by tsutsui in ticket #393):
distrib/atari/floppies/install/list: revision 1.21
distrib/atari/floppies/common/dot.profile: revision 1.6
Avoid use of expr(1).
It was removed from src/distrib/atari/floppies/install/list since rev 1.19
and the install script complains expr is not found.
Should be pulled up to netbsd-8.
Put back /bin/cp and /sbin/sysctl to installation binaries.
- cp(1) is explicitly required by sysinst(8), cp_to_target() in
  src/usr.sbin/sysinst/target.c, to copy bootloader to targetroot
- sysctl(8) is required by src/distrib/atari/floppies/common/dot.profile
  to detect the root device (fd or md)
This might cause floppy overflow on HEAD again, but works on 8.0_BETA.
Should be pulled up to netbsd-8.

(martin)