Broken double description of hypercube

[gh-kliem]

Turns out the double description of the hypercube after #28866 is not set up incorrectly.

This wasn't detected due to a meaningless doctest.

sage: intervals = [[-2,2]]
sage: polytopes.hypercube(1, intervals)
A 0-dimensional polyhedron in ZZ^1 defined as the convex hull of 1 vertex

[gh-kliem]

New commits:

​5c7e562

fix double description of hypercube

[gh-kliem]

Thank you.

[mjo]

We really need to turn off the fake randomness by default in doctests. I've missed so many bugs in exactly the same way.

[gh-kliem]

I agree. I just posted about this on sage-devel.

[git]

Branch pushed to git repo; I updated commit sha1 and set ticket back to needs_review. New commits:

​e1bf211

remove set_random_seed