Enable different doses for the same analysis round

[FloBay]

At the moment, the analysis expects the same drug range for all observations, and data is imported in a "wide format" (responses next to each other).

However, some users have different dose ranges, which can only be solved by running multiple batches or introducing many NaNs in the wide format, which is also more of a hack than a solution.

The correct way would be to enable doses encoded in a "long format" input, and these doses must be accessible in the fitting procedure and the dashboard. This will require many changes in the backend + some new parser + toml argument which specified the input.

Perhaps do this after the next v06 release?