Add plate well concentrations to output data

src/main/java/Plate.java

@@ -28,11 +28,15 @@ public class Plate {
         this.sourceFile = sourceFileName;
         this.wells = wells;
         this.size = wells.size();
+
         List<Integer> concentrations = new ArrayList<>();
         for (List<Integer[]> w: wells) {
             concentrations.add(w.size());
         }
-        this.concentrations = concentrations.toArray(new Integer[concentrations.size()]);
+        this.concentrations = new Integer[concentrations.size()];
+        for (int i = 0; i < this.concentrations.length; i++) {
+            this.concentrations[i] = concentrations.get(i);
+        }
     }
 
     public void fillWellsExponential(String sourceFileName, List<Integer[]> cells, double lambda){