Before the result of the GridInterpolator was transposed for 1 additional dimesion and mixed for more. This has been fixed

before default rotor center was shared among wind farm models, i.e. wakedeficit model of last instance was applied to all instances

renamed GCLDeficitLocal to GCLLocalDeficit
renamed NOJDeficitLocal to NOJLocalDeficit
made NOJLocalDeficit subclass of NiayifarGaussianDeficit to reuse k_ilk function
add tests to test_deficit_models.py

add function to create XRSite from simulation_result.flow_box() allowing precalculated sites including effects of neighbouring farms

Implemented wake_radius() function for the different wake models and modified args4turb to be independant from deficit