Fix edge cases in history (jax scalar) and add tests

* switch from stacked-columns to stacked-rows for super-op representation

* fix superop maxconn

* fix test for new format

* harden test

* fix propagation of is_hermitian in mcmixed

* add doc page

Use explicit group structure for graph symmetries

Add test for Pauli algebra

* Fix precision issue in lattice

* Update Test/Sampler/test_sampler.py

Co-authored-by: Filippo Vicentini <filippovicentini@gmail.com>

cleanup SR

Fix website broken link

Co-authored-by: Damian Hofmann <femtobit@users.noreply.github.com>

Co-authored-by: Filippo Vicentini <filippovicentini@gmail.com>

Co-authored-by: Filippo Vicentini <filippovicentini@gmail.com>

Co-authored-by: Filippo Vicentini <filippovicentini@gmail.com>

* return info object when using SR iterative solvers.

* make fields there by default