Trac 16275: fixes for the previous commit; btw its title should have read: removed sage.modular.abvar.homspace.Homspace.__reduce__

- Removed remains of the __reduce__ method
- Trivial doctest fix
Merge branch 't/16275/hom__introduce_a_check_argument_to_simplify_the_unpickling_detection_logic' into categories/over_a_base_category-15801
Make it so that old homset pickles remain unpicklable
trac #16235: A pair of orthogonal latin squares of order 10
Merge branch 'categories/axioms-10963' into categories/over_a_base_category-15801
#15801: Initialize the base ring for module homsets
#15801: doctests for CategoryObjects.base_ring + docfix in Modules.SubcategoryMethods.base_ring
Fix one test and simplify the logic of unpickling old homset pickles
Simplicial complexes are now CategoryObject. Switch TypeError into ValueError
extending functionality of with_final_word_out and inplace-version

- there is now a flag allowing that not all states have to be final
  after calling with_final_word_out
- multi-letter inputs are now supported
- an inplace version of this function was added
- FiniteStateMAchines now has "with_final_output" so that this can
  be called after construction directly
Merge branch 't/16229/fsm/latex-loop' into t/16266/fsm/accepting_show_empty_final_word_out_1

* t/16229/fsm/latex-loop:
  corrected one PEP8-spacing
  FiniteStateMachine._latex_ and latex_options: customize loop position
trac #16279: BIBD from Transversal Designs
adapted one doctest after merge of #16229
trac #16269: Merged with 6.2.rc1
trac #16269: Reviewer's remarks
Get rid of warnings about missing git templates after relocating Sage
#16280: Fix call for FiniteEnumeratedSet's of plain Python objects
trac #16277: Reviewer's remarks
#16280: Trivial doctest fixes
Merge branch 'develop' into ticket/13528