With sage-5.0.beta13 plus #715, #11521, #12875, #12877, #12215 and trac_12876_category-fix_abstract_class-nt-rel11521.patch, all doc tests pass.
I made some additional cosmetic changes in a reviewer patch.
Further questions:
In sage/category/hecke_modules.py, you refer to ticket number ??? for fixing _test_zero and _test_elements. In sage/schemes/elliptic_curves/ell_curve_isogeny.py, you leave a reference to trac open as well. Have the tickets now been created? I didn't fix that yet.
I see that you rename Rings.HomCategory.ParentMethods.__new__ into __new__bx. Does that mean the ugly __new__ method ought to be removed (finally!)?
But then, shouldn't __getnewargs__ be removed as well?
Please tell whether you want to address these questions in an additional patch. And I hope you agree with adding #715, #11521 and #12215 to the dependencies? Only #12215 needs review (hint...).
If you do agree, then put this to positive review, please.
Apply trac_12876_category-fix_abstract_class-nt-rel11521.patch trac_12876-reviewer.patch
