Update comments and program version

Author: alchemistmatt

src/main/java/edu/ucsd/msjava/msutil/Enzyme.java

@@ -396,10 +396,11 @@ private static void register(String name, Enzyme enzyme) {
         enzymeTable = new HashMap<String, Enzyme>();
         registeredEnzymeList = new ArrayList<Enzyme>();
 
-        // Do not include "UnspecificCleavage" in HashMap enzymeTable
+        // Add "UnspecificCleavage" to registeredEnzymeList
+        // but do not call register to put it in the HashMap enzymeTable
         registeredEnzymeList.add(UnspecificCleavage); // 0
 
-//		register(UnspecificCleavage.name, UnspecificCleavage);
+	    // Skip (see above): register(UnspecificCleavage.name, UnspecificCleavage);
         register(TRYPSIN.name, TRYPSIN);              // 1
         register(CHYMOTRYPSIN.name, CHYMOTRYPSIN);    // 2
         register(LysC.name, LysC);                    // 3

src/main/java/edu/ucsd/msjava/ui/MSGFPlus.java

@@ -21,8 +21,8 @@
 
 
 public class MSGFPlus {
-    public static final String VERSION = "Release (v2018.06.27)";
-    public static final String RELEASE_DATE = "27 June 2018";
+    public static final String VERSION = "Release (v2018.06.28)";
+    public static final String RELEASE_DATE = "28 June 2018";
 
     public static final String DECOY_DB_EXTENSION = ".revCat.fasta";
     public static final String DECOY_PROTEIN_PREFIX = "XXX";