Half of the users of this include only need the type definitions and
not the manipulation macros nor the inline functions. Moves the various
types into mini-clist-t.h makes the files cleaner. The other one had all
its includes grouped at the top. A few files continued to reference it
without using it and were cleaned.
In addition it was about time that we'd rename that file, it's not
"mini" anymore and contains a bit more than just circular lists.
Add test-list.c, a stress-test for mt_list, to ensure there's no concurrency
issue.
The number of threads is provided on the command line, and it randomly
add, removes, or parses the list until it made MAX_ACTION actions (currently
5000000).