Added tag 5.6.beta0 for changeset 473374c8a146
Trac #12587: Fixed __hash__() for SimplicialComplex by giving immutable option
Trac #12587: review
Trac #12587: Referee patch: document deprecation of vertex_set, etc., in ref manual.
Trac #11795: allow customization of browser, dvi/pdf/png viewers
Trac #11795: Easily customize different viewers for PNG, DVI, PDF - reviewer's patch
Trac #11763: Add ZZ as allowed base ring for polyhedra
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Trac #11763: Parents for polyhedra
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Trac #11763: relax typechecks

Some plotting commands needlessly require that the
input is a Python list. This patch relaxes typechecks
to allow arbitrary iterables.
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Trac #11763: remove trailing whitespace
Trac #11763: fix the associahedron

The Associahedron class derives from Polyhedron_QQ_ppl. It must
be converted to the parent/element framework as well.
Trac #11763: Lazily import Polyhedron
Trac #13742: No Permutation should be created that its method cannot handle
Trac #13742: fixes for WeightedIntegerVector etc
Trac #13742: in some cases permutations with cycles of form (x,x) were created. This is now fixed
Trac #13503: Speedup is_triangle_free, add triangles_count, and minor change to spanning_trees_count
Trac #9016: make some morphisms hashable
Trac #13708: get assumptions by variables
Trac #13708: eliminate strings operations while checking if assumption has variable
Trac #11768: Find source lines of dynamic classes (e.g., parent_class of a category)
        Tests are independent of #12876
Trac #13785: Export a graph to a dictionary
Trac #13789: opposite of sparse polynomials
Trac #13796: Fix bug in Steenrod algebra multiplication