- All2AllIterative: Use PropagateDownwind WS_eff as initial guess, determine unstable flow cases and limit WS_eff of idling WT in unstable flow cases to max previuos WS_eff
- Apply rotor average model on blockage deficit
- Speed up Rathmann and SelfSemilarity by implementing calc_layout_terms etc.

update power_xylk, aep_xylk and aep_xy in flow map to support multidimensional power curves. fixes #66