Determine best way to implement fine output bin DRM

[grazwegian]

Testing has shown that using a response matrix with fine output energy bins reduces systematic uncertainty and matches more closely with expected results. However to use this in OSPEX requires changes to the inner workings at the stage where the response matrix is applied and so is not something that can be changed by the STIX Team.

Options to resolve this include:

Create a forked version of the OSPEX code that would be part of the STIX GSW and call that instead of the standard OSPEX

Arrange for changes to the upstream version of OSPEX - additional checks so that the new code would only be run for STIX data could be implemented.