### atree-2.0 README file

    - The RANDOM macro defined in atree.h uses the lousy but portable
    rand() function (results of rand() are shifted to make it slightly
    better), you are encouraged to change it for your system.
    Just make sure that RANDOM(b) returns a number between 0 and b-1
    (ie. replacing rand() with a function returning negative numbers
    will have unpleasant consequences).