[net.notes] Moving the sequencer info out of notes

sjb (08/07/82)

There is an easy solution (easy sounding anyway) to this problem.
If the sequencer info was updated as the *LAST* things notes does,
then right before it was written out, notes could do a:
	setuid(getuid());
(a small kernel change is needed for this if you cannot presently
do it) and that would turn the setuid bit off.  Again though, this
has to be the last thing that notes does, as there is no way (that
I know of) to recover the setuid bit.