improved dup_roots_upper_bound; what used to be counter t is now list t
fixed the min in dup_roots_upper_bound
added a line I had missed to copy
replaced tabs by spaces
"beautified" comments
more "beautification"; hope last commit
comments became green
changed variable Q to QL but problems still persist
returned code to original form; still do not see why does not pass Travis CI
Update the intervals in tests
Merge pull request #7494 from certik/pr-7257

improved dup_roots_upper_bound