Bug report: planar calculation results use zero yaw angles by default instead of the specified simulation yaw angles

[pjireland]

Bug description
calculate_horizontal_plane, calculate_cross_plane, and calculate_y_plane use a zero yaw angles if called with yaw_angles=None. A more intuitive behavior to me is to use the existing yaw angles from self.floris.farm.yaw_angles.

To Reproduce

1. Run any case with non-zero yaw angles.
2. Call calculate_horiziontal_plane (for example) on the case, and pass the result to visualize_cut_plane.
3. Observe from the output that the flow corresponds to that of zero yaw angles.

Expected behavior
I would have expected to default to the existing yaw angles from self.floris.farm.yaw_angles instead.

Floris Version
3.1

System Information (please complete the following information):

• OS: Windows 10
• Library versions
  • matplotlib: 3.5.2
  • numpy: 1.22.3
  • pytest: 7.1.2
  • scipy: 1.8.1

[misi9170]

This is no longer a problem in v4; see examples/examples_control_optimization/001_opt_yaw_single_ws.py for an example, where for example these lines set the yaw angles; calculate the planes (the fmodel.run() step is actually completely unnecessary there); and visualize with the set yaw angles as expected.