Add a /bin/tty command that prints the current tty.

Also fix ttyname() syscall to include "/dev/" in the name.

Kernel/sync.sh

@@ -0,0 +1,25 @@
+cp -p _fs_contents.stock _fs_contents
+mkdir mnt
+mount -o loop _fs_contents mnt/
+cp -R ../Base/* mnt/
+cp ../Userland/sh mnt/bin/sh
+cp ../Userland/id mnt/bin/id
+cp ../Userland/ps mnt/bin/ps
+cp ../Userland/ls mnt/bin/ls
+cp ../Userland/pwd mnt/bin/pwd
+cp ../Userland/sleep mnt/bin/sleep
+cp ../Userland/date mnt/bin/date
+cp ../Userland/true mnt/bin/true
+cp ../Userland/false mnt/bin/false
+cp ../Userland/hostname mnt/bin/hostname
+cp ../Userland/cat mnt/bin/cat
+cp ../Userland/uname mnt/bin/uname
+cp ../Userland/clear mnt/bin/clear
+cp ../Userland/tst mnt/bin/tst
+cp ../Userland/mm mnt/bin/mm
+cp ../Userland/kill mnt/bin/kill
+cp ../Userland/tty mnt/bin/tty
+sh sync-local.sh
+cp kernel.map mnt/
+umount mnt
+sync