* Fix rear_imge test and description
* replace '/' by os.path.sep
* Extend error messages to include expected filenames
* fix image path (use elevation-images as base dir)
* add quotes around expected path
* Improve failure message
* remove redundant image description
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Co-authored-by: Giotta Simon <simon.giotta@ruag.ch>
Co-authored-by: Daniel W. Anner <daniel.anner@danstechsupport.com>
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