[OctDev] missing copyright statements

[Dmitri A. S. <das...@gm...>]

Since we are on subject of copyright.

I was looking for files in octave-forge
with missing clear copyright statement.
There are quite a few of those.

Here some of them:

main/vrml/
	most files (Etienne Grossmann  <et...@is...>)
	(some files do not have even author name)

main/general/
	deref.cc (?)

main/control/
	feedback.m (Ben Sapp <bs...@la...>)

main/image/
	imginfo.m (Etienne Grossmann  <et...@is...>)

	imread.m (Andy Adler)

	imwrite.m (Andy Adler)

	testimio.m

main/irsa/
	irsa_actcore.m ( Joerg Huber ?)

main/linear-algebra/
	GramSchmidt.cc (P.R. Nienhuis <106...@co...>?)

main/optim/
	cdiff.m (?)
	wsolve.m (Paul Kienzle ?)

main/signal/
	flattopwin.m (Paul Kienzle ?)
	freqs_plot.m (Paul Kienzle ?)
	ellipdemo.m (Paul Kienzle ?)

main/symbolic/
	probably_prime.cc (?)

main/specfun/
	expint.f (D.E. AMOS)
	Why do we need this file there at all?

main/struct/
	struct.cc (Etienne Grossmann  <et...@is...>)

main/time/
	datesplit.m  (Bill Denney <bi...@gi...>)

extra/ver20
	most files (Paul Kienzle)


I think something has to be done about it.

Sincerely,
Dmitri.
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