This patch adds cl-seq-equal to test whether two lists have the 
same elements. I.e., if every element of LIST1 also appears in 
LIST2 and if every element of LIST2 also appears in LIST1. 

-- 
Damien Cassou
http://damiencassou.seasidehosting.st

"Success is the ability to go from one failure to another without
losing enthusiasm." --Winston Churchill