Trailing singletons in min/max functions

[David Bateman]

Both 3.0.x and 3.1.x leave trailing singletons in the matrices they
return.. This can be seen with

x = reshape (1:8,[2,2,2]);
[y, i ] = min (x, [], 3);
size(y)

The attached patch addresses this, moves the min/max tests from
test_arith.m to minmax.cc and adds an additional test for this issue. It
also fixes a possible 64-bit indexing issue..

Regards
David

-- 
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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