Reduce memory consumption of All2AllIterative with NOJDeficit + add test of memory usage and memory leak

Allow different superposition models for wake and blockage + add blockage to flowmap with weightedSum (was missing before)

fixing "Using a DataArray object to construct a variable is ambiguous, please extract the data using the .data property" issue introduced in xarray 0.19.0

Alex authored 3 years ago and Mads M. Pedersen committed 3 years ago

codestyle and test crash fix

implement support for i-dependent WS and WD in site and wt-dependent WS and WD kwarg to WindFarmModel.__call__