Hello Guix,

This patch adds a few more inputs to our octave package.  Arpack is 
needed for the "eigs" function.  Previously, we had the fltk input, but 
without glu it's essentially useless.

I had wanted to also add Suitesparse, but there are some compilation 
problems yet.

I took the liberty of wrapping some lines to 80 columns at the same 
time.

-- 
`~Eric