Configuration of the installed file locations

In Debian, we have a process to test the build of all packages so that a repeat build produces identical binaries. https://reproducible-builds.org/

xrstools is failing these tests, primarily because the source code uses code like:

os.path.join(os.path.dirname(os.path.abspath(__file__)),

in multiple locations.

I am currently having to patch each of these to refer to a single basepath matching the final installation directory for the package:

/usr/lib/python3/dist-packages/XRStools/resources/

It would be useful if XRSTools could set the expected base path once and then pick up that path each time it needs to set such a path. Then Debian would be able to set an alternative in just one place.

Current patch: https://salsa.debian.org/science-team/xrstools/-/blob/master/debian/patches/reproducible_build.patch

This patch isn't usable upstream directly, however, there are other locations within the codebase where reference is made to __file__ to build paths. It would be useful if all such occurrences used a single configurable base path instead of trying to use __file__.