default colormap

[Carlo De Falco]

Hi all,

The purpose of this changeset: 
http://hg.savannah.gnu.org/hgweb/octave/rev/17e507df10e3
was to change the default colormap for the 4.2 release.

This unfortunately seems to not have worked as you can easily check by the 
following simple
test in te current development branch:

[x, y] = meshgrid ( linspace (0, 1, 8));
z = x .* y;
surf (x, y, z);

and then

colormap ('default')

I think the issue is with the re-implementation of jet in graphics.cc:

http://hg.savannah.gnu.org/hgweb/octave/file/77b104cad58e/libinterp/corefcn/graphics.cc#l136

do I just need to change the function jet_colormap in order to fix the issue?

c.