Make nebular module ajustable to different SSP / IMF
Currently the nebular module uses a single “nebular model” that was build using a specific SSP (now BC03) and a given IMF (now Chabrier). The problem is that we may use this module with another IMF and / or another SSP. For instance, to use BPASS we need to replace the nebular models and rebuild the database.
The nebular module should be able to handle different models for different SSP and IMF and use the right one during the run by inspecting what was used by the stellar emission module.