tape_umask=017 for all tapes. This has a significant effect only
for ft and st (they were created with the wrong umask 002 and then
chmod'ed to mode 640; now they are created with mode 660).
Chmod the st control devices (mode 3) to 600. These need to be
more secure than the st i/o devices, but were less secure.
Use the default umask of 077 for joy0. 002 gave mode 664, which
is insecure.
Use umask 037 for ch*. Cosmetic.
Removed redundant chmod's.
Sorted case lists for disks.
6a188c276a