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

fix condition to determine if two wt are the same. Before dw and hcw should be 0 but with rotor average models, hcw may be gt 0

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

add selfsimilarity blokage model
prepare for gradients
New structure. Old WakeModel mainly in new EngineeringWindFarmModel
add deflectionmodel
update documentation