Octave Forge: Promote link to package documentation

[Oliver Heimlich]

Octave forgers,

currently only two packages (optim and interval) have a dedicated 
package documentation hosted at Octave Forge together with their 
function reference. I find a package manual very useful and important to 
explain concepts that are common to several functions. This kind of 
information can hardly be presented in the function reference.

However, the link to the package documentation looks unimpressive and I 
would like that changed.

I have added two icons (see attachements, sources at [1]) and extended 
the colored box of the function reference. This requires minimal changes 
to octave-forge.css and the generate_html package.

I had also experimented with separate coloured boxed for each link (from 
the Tango Icon color theme), but that was overkill.

What do you think of the proposed change?

Oliver

[1]
https://commons.wikimedia.org/wiki/File:Gnome-task-due.svg
https://commons.wikimedia.org/wiki/File:Accessories-dictionary.svg

octave-forge-icons-proposal.png
Description: PNG image

manual.png
Description: PNG image

news.png
Description: PNG image