Improve test file for Circulation (#175)

- Bug fix: add a missing #include.
- Add compile test for various functions and named parameters.
- Use a smaller digraph with lower bounds.
- Test eight instances instead of two.
- Remove the doc that was for the demo file.

 if WANT_TOOLS

 bin_PROGRAMS +=

 dist_bin_SCRIPTS += tools/lemon-0.x-to-1.x.sh

 endif WANT_TOOLS