Move some code from Brandt modules to quaternion algebras #37090
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This moves the following helper functions from Brandt modules to (public or private) methods of quaternion algebras, where they should be easier to access:
basis_for_left_ideal()
function: moved to_left_ideal_basis()
methodright_order()
function: moved to_right_order_from_ideal_basis()
methodquaternion_order_with_given_level()
function: moved toorder_with_level()
methodWe add deprecations for these functions and also deprecate the function
maximal_order()
in favour of the existingmaximal_order()
method of quaternion algebras.