trac #15466: Remove deprecated code from combinat/
A few more deprecations
trac #15489: deprecate the dim argument for MIPVariables
trac #15489: rebase on 5.13.rc0
trac #15489: fix doctests and adds notes to remove code later
Birational toggles and birational rowmotion on finite posets
#14793: Use __reduce__ for pickling homsets, and use WithEqualityById for them
Some review changes.
Trac 14793: Add a missing doctest
Trac 11239: fix coercion of polynomials over finite fields, first step
Trac 11239: fix coercion of polynomials over finite fields
Some docstring reviewer changes.
final fixes
Merge branch 'develop' into rowmotion
Trac 15667:  speed up point order when j=0,1728
Merge branch 'develop' into rowmotion
Merge branch 'u/andrew.mathas/ticket/15466' of trac.sagemath.org:sage into u/tscrim/ticket/15466
Fixed failing doctests for #15466.
Improve Parent.__getitem__

- make it work for Cython objects too
- do not catch AttributeError's raised by the method we found
Move __getitem__ from rings.ring to categories.ring