infinite loop in circshift for empty matrices

[David Bateman]

The function circshift(x,n) should return x if x is empty, whereas in
Octave it currently results in an infinite loop. Patch attached with a
few tests added.

D.

-- 
David Bateman                                David.Bateman at motorola.com
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 6 72 01 06 33 (Mob) 
91193 Gif-Sur-Yvette FRANCE                  +33 1 69 35 77 01 (Fax) 

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