Merge branch 'fix/Stability3D' into 'master'
Tidy linearised advection and fix full 3D This MR simplifies the logic of `LinearisedAdvection::v_Advect`, reducing the dependency on the dimension and handling all components in a single loop. In doing so, I think this fixes the full 3D case, which was not working. Also, the gradient of the base flow is now computed in a separate function and stored in `m_gradBase`, avoiding the need to recompute this every time-step for steady base flows. The adjoint advection is now derived from LinearisedAdvection, eliminating a lot of duplicate code. It only needs to redefine v_Advect, which now follows a similar structure to the new implementation from LinearisedAdvection. See merge request !708
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