Add mbr and bteasy17 to tst01
read partitions from kernel instead of disk.
Still problems with writing labels, discussing with Bruce.
Extended slices doesn't get written yet.
Made an All_FreeBSD() function.
Added a cmd-line interface (lowest rank) to the tst01 program.
The tst01 program is harmless (worst it can do is coredump), but it
is instructive to run, you can see what the slice-code things of your
disk...
