Resolve "Aggregated output needs to respect the damage states as given by the fragility functions"

The losscalculator output aggregated over buildings or tiles does use hard-coded column names of the damage states. This MR implements the use of column names based on the limit states as given in the fragility model.

Closes #56 (closed)

\approve @shinde @tara

Edited by Danijel Schorlemmer

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