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
Explicity set range for 2D line plot
Takes maximal span
Update plot.py
Update plot.py
Merge pull request #7333 from shashank-agg/incorrect_range

 issue #6893: plot does not use the given range.
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Merge pull request #7492 from smichr/auth

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Update the intervals in tests
Added _eval_Abs for polar_lift

Abs is the same on every branch, so this is ok.
fixes #7450

>>> Abs(polar_lift(-1-I))
sqrt(2)
>>> integrate(exp(-(1+I)*x), (x, 0, oo))
sqrt(2)*exp(-I*pi/4)/2

Added a test for Abs(polar_lift(..))
Added test for the integral mentioned in the issue.
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