Add dummy controller for primary simulation

[karimali5]

Changes in here

When wind-angle controller is activated for both the precursor and the primary simulations, the controller action for the primary starts to strongly oscillate leading to strong pressure oscillations which contaminate the solution.

For example in the below figure, the blue markers show the control action of the primary simulation when it has its own independent controller versus that of the precursor simulation (black). The control action of the primary simulation oscillates between the controller trigger (around 0.1) and ~15 degrees.

This behavior leads to nonphysical velocities as indicated by the hub-height slice of the normalized streamwise velocity ($u/G$).

The solution here is to introduce the flag 'dummy_controller' (true or false) in the &CONTROL namelist. When activated for the primary simulation, a dummy wind-angle controller is created which points to the controller of the precursor simulation.

When the controller action is being calculated (in 'update_RHS_control' being called from 'popRHS_stuff.F90'), the dummy controller mimics the action of the precursor controller and applies this action to the primary flow field rather than calculating its own action based on the primary flow field.

The resulting control action and wind-speed field are shown above labeled 'dummy controller'.