[ogs] Added -s parameter used for locating Python BC scripts.

Lars Bilke requested to merge bilke/ogs:python-bc-path-m into master

Is useful when the prj-file is located somewhere else than the other input files (e.g. when it is generated via some tooling in the build directory).

  1. Feature description was added to the changelog
  2. Tests covering your feature were added? Will be in !4350 (merged).
  3. Any new feature or behavior change was documented?

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