minimal_nonfaces: fix column number of IncidenceMatrix

[benlorenz]

this is a workaround until that is fixed in polymake
add testcase
fixes #1440

julia> P = convex_hull([0 0 0; 0 0 1; 1 0 1; 1 1 1; 0 1 1]);
julia> (v1,v2) = NormalToricVarietiesFromStarTriangulations(P);
julia> stanley_reisner_ideal(v2)
ideal(x1*x3)

julia> stanley_reisner_ideal(v1)
ideal(x2*x4)

cc @HereAround @lkastner

[HereAround]

Thank you @benlorenz - looks good to me!

I am thinking about adding the corresponding toric varieties example to the documentation as it is kind-of famous (conifold transition). Since the tests are quick, this double-testing should not hurt I believe?

[benlorenz]

I am thinking about adding the corresponding toric varieties example to the documentation as it is kind-of famous (conifold transition). Since the tests are quick, this double-testing should not hurt I believe?

That should be fine yes.

[HereAround]

Looks good to me! Thank you.