Refactor: non-constant String concatenation

.../zellige/steps/construction/rounds/ConstructionRound.java

...ellige/steps/construction/rounds/ose/OseConstruction.java

...e/utils/jzy3D/HM_black_GT_distanceDisplay_realImages.java

...tils/jzy3D/HM_black_GT_distanceDisplay_realImages_2D.java

...n/java/fr/pasteur/ida/zellige/utils/jzy3D/OSEDisplay.java

...va/fr/pasteur/ida/zellige/utils/jzy3D/OSEListDisplay.java

...va/fr/pasteur/ida/zellige/utils/jzy3D/SurfaceDisplay.java

...ain/java/fr/pasteur/ida/zellige/utils/test/CSVWriter.java

...ur/ida/zellige/utils/test/RMSEAndCoverageComputation.java

...n/java/fr/pasteur/ida/zellige/utils/test/ZParameters.java

...teur/ida/zellige/behavior/StartingOSESameSurfaceTest.java