Improve simple script to compare Finesse2/Finesse3 compare.py
The compare.py script allows simple comparisons of Finesse 2 versus Finesse 3, using legacy kat script. This is useful for quick debugging checks, as it works stand-alone and e.g. can be imported into notebooks with one line.
Currently it lacks a lot of the functionality from the test scripts of BEST, for example setting required extra axes for ccd detectors (see issue #42 (closed)), or handling yaxis settings correctly.
Ideally the code of both scripts should be simplified so that the same code could be use for both purposes. (Currently the test scripts from BEST create and compare output files, whereas compare compares directly from the output objects, therefore these are not trivial to merge).