Hello,

this is my first contribution to this project.  I hope everything is
right with this package definition for GNU XaoS
(see https://www.gnu.org/software/xaos/).  It's a nice program to
discover fractals, so I decided to use it for my first packaging
attempt.

"guix-lint" worked fine and without error messages after I had
corrected some little things. Please let me know if something is wrong.

Fabian Harfert