Generalize extreme values calculation and excel report generation

Nicolau Conti Gostrequested to merge
nicgo_DLB_dataarray into master
  • Now get_DLB_extreme_loads is generalised so it can handle any collected DataArray, not only sectorwise extreme loads. It is also much faster thanks to vectorization.
  • dataarray_to_excel is now generalised too, so any DataArray can be converted to an excel file.

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