Feature request: export ΔRFU linear bars grouped by state

Feature request (web application):
Select one state as reference, then export linear bars grouped by state, consisting of the various exposure times

The problem with this at the moment is the unfortunate plotting API where the plotting functions take a `reference` parameter and then calculate dRFU / dG if this is given. It would be better to input the dRFU / dG data directly

Start by tracing the plotting functions that accept a `reference` parameter and the current export path. The work is done when a selected reference state can produce exported linear bars grouped by state and exposure time using direct dRFU/dG data.

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