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* first roughness lenght must always be zero

It now only shows emergent wspd and pd. The tutorials have been
adapted accordingly.

With the introduction of geopandas vectormaps and xarray
ratermaps, we had to change several of the tutorial routines

Merge branch '8-adding-example-for-wwh-file' of https://gitlab-internal.windenergy.dtu.dk/WAsP/WAsP/pywasp_examples into 8-adding-example-for-wwh-file

See corresponding branches in pywasp#136
and pywaspio

Only kept the tutorial examples and removed bunch of folders containing smaller scripts.

all examples updated