Feature/add missing jrc flood impact functions (#111)

* add sectorial impact functions

* adjust tests due to different roundin, kwargs and function names

* update tutorial

* capture unknown sector

* add tests looping through params and testing unknown ones

* impact_funcs.river_flood: use dicts instead of if/else blocks

* remove unnecessary mdr attribute

* remove un-used dictionary

* adjust object initiation

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Co-authored-by: emanuel-schmid <[email protected]>