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

- add missing h_i parameter in call from calculate_AEP
- update parqueFicticio grd files
- change site.probability function to take ws_bins instead of ws_bin_size
- correct probability calculation in WaspGridSite
- add test that compare WaspGridSite with results from Wasp (raw data, u_mean, air_power and aep)
- add function in OneTypeWindTurbines to instantiate from tabular data

deleted test_examples.py as all example modules are tested in test_main.py

- ti_map added
- default ti changed from 0.75 to 0.075

power and ct funcs are now a list of functions (one element pr type) similar to name, diameter and hub_height