Fixes #704 by introducing a regularization for the saturation if it is zero to avoid singular matrices in areas where there is no transporting fluid and hence no tracer.
Step 1. Fetch and check out the branch for this merge request
git fetch origin git checkout -b feature/tracer-multiphase-test-zero-saturation origin/feature/tracer-multiphase-test-zero-saturation
Step 2. Review the changes locally
Step 3. Merge the branch and fix any conflicts that come up
git fetch origin git checkout origin/master git merge --no-ff feature/tracer-multiphase-test-zero-saturation
Step 4. Push the result of the merge to GitLab
git push origin master
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