Refactor plate to fill its own wells in its constructor

src/main/java/Simulator.java

@@ -113,7 +113,7 @@ public class Simulator implements GraphModificationFunctions {
                 distCellsMapAlphaKey, plateVtoAMap, plateVtoBMap, plateAtoVMap,
                 plateBtoVMap, alphaWellCounts, betaWellCounts, time);
         //Set source file name in graph to name of sample plate
-        output.setSourceFilename(samplePlate.getSourceFileName());
+        output.setSourceFilename(samplePlate.getFilename());
         //return GraphWithMapData object
         return output;
     }