Invoke garbage collection

src/main/java/UserInterface.java

@@ -319,6 +319,7 @@ public class UserInterface {
         assert filename != null;
         CellFileWriter writer = new CellFileWriter(filename, sample);
         writer.writeCellsToFile();
+        System.gc();
     }
 
 //    //for calling from command line
@@ -465,6 +466,7 @@ public class UserInterface {
             System.out.println("Writing Sample Plate to file");
             writer.writePlateFile();
             System.out.println("Sample Plate written to file: " + filename);
+            System.gc();
         }
     }
 
@@ -513,6 +515,7 @@ public class UserInterface {
             System.out.println("File I/O time is not included in results.");
             dataWriter.writeDataToFile();
             System.out.println("Graph and Data file written to: " + filename);
+            System.gc();
         }
     }
 
@@ -567,6 +570,7 @@ public class UserInterface {
         System.out.println("Writing results to file");
         writer.writeResultsToFile();
         System.out.println("Results written to file: " + filename);
+        System.gc();
     }
 
     ///////