While working on http://trac.sagemath.org/ticket/10276, we had trouble 
running Polyhedron with RDF precision.
An explicit example showing the issue is in  
http://trac.sagemath.org/raw-attachment/ticket/10276/x.sage

What happens is that Polyhedron() finishes normally, but it creates 
something that looks like inconsistent data
(a closer inspection reveals that one of the 136 facets of this polytope 
does not "contain any vertices", in the
sense that the corresponding inequality is not satisfied with equality 
(within the meaningful precision)).
At least this data is not good enough to compute the face lattice of it.

Without a better knowledge of Polyhedron() code it is hard for me to decide 
whether this is a bug.

Any comments?
Thanks,
Dima

PS. if I use non-default 'field' backend I also get some weird error on 
this data, but it works fine if I use
QQ as the base_ring.

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